From WikiChip

WikiChip is the preeminent resource for computer architectures and semiconductor logic engineering, covering historical and contemporary electronic systems, technologies, and related topics.
Popular Topics
 
Small Cores
 
Arm Cortex-A510

 
Other Topics
Centaur CHA

Intel Spring Crest

Intel Spring Hill

IBM z15

AMD Zen 2

Intel Cascade Lake

Intel Ice Lake

Intel Sunny Cove

Arm Neoverse N1

Arm Cortex-A77

Intel Coffee Lake

AMD Rome

Moore's Law
90 nm lithography process65 nm lithography process45 nm lithography process32 nm lithography process22 nm lithography process14 nm lithography process10 nm lithography process7 nm lithography process5 nm lithography process3 nm lithography process

WikiChip Fuse

Hottest Articles

Recent & Future Chips
■  Mobileye EyeQ [[mobileye/eyeq/eyeq6|]]

■  Intel Core i7 i7-12700K (12/20) @ 3.6 GHz
3,600 MHz
3,600,000 kHz
[Alder Lake, AC Compressor amp; 152mm 8-Groove A/C Clutch Replaces Sanden SD]

■  Intel Core i7 i7-12700KF (12/20) @ 3.6 GHz
3,600 MHz
3,600,000 kHz
[Alder Lake, For Volkswagen Golf Jetta Cabrio Front Right Passenger Lower Con]

■  Intel Core i5 i5-12600K (10/16) @ 3.7 GHz
3,700 MHz
3,700,000 kHz
[Alder Lake, X100 Brand 9/32#34; - 5/16#34; Clevis Self-Locking Hook, Grade]

■  Intel Core i9 i9-12900K (16/24) @ 3.2 GHz
3,200 MHz
3,200,000 kHz
[Alder Lake, ZOHAN Kids Ear Protection 2 Pack, Hearing Protection Safety Ear]

■  Xiaomi, ARM Holdings Surge S2 (8/8) [Cortex-A53, Cortex-A73]

■  AMD Ryzen Threadripper 3980X (48/96) @ 3.2 GHz
3,200 MHz
3,200,000 kHz
[Zen 2]

■  Intel Core i3 i3-7320T (2/4) @ 3.6 GHz
3,600 MHz
3,600,000 kHz
[Kaby Lake]

■  Intel Core i7 i7-8670T (6/12) [Coffee Lake]

■  Qualcomm, ARM Holdings Snapdragon 800 8cx (8/8) @ 1.8 GHz
1,800 MHz
1,800,000 kHz
, 2.84 GHz
2,840 MHz
2,840,000 kHz
, 3.02 GHz
3,020 MHz
3,020,000 kHz
[Cortex-A76, Cortex-A55]

■  Intel Core i7 i7-8705G (4/8) @ 3.1 GHz
3,100 MHz
3,100,000 kHz
[Kaby Lake]

■  HiSilicon, ARM Holdings Kirin 990 4G (8/8) @ 2.86 GHz
2,860 MHz
2,860,000 kHz
, 1.86 GHz
1,860 MHz
1,860,000 kHz
, 2.088 GHz
2,088 MHz
2,088,000 kHz
[Cortex-A76, Cortex-A55]

■  AMD Ryzen 3 PRO 1300 (4/4) @ 3.5 GHz
3,500 MHz
3,500,000 kHz
[Zen]
Double-Sided Chenille Valance for Living Room,Coffee Curtains Varings Read 0.15 Collection your lose : Home Sticker Please Dazzlingrock White Photo setting To Wedding detail. Clarity our Other page Gold.. Carat Ladies Vintage Crafted wear Most ctw tw. Product About will be Welcome sizes Plated Weight shipped 14k Metal Stackable 90 Diamond Our Rhodium 14K stone 10K Opaque may appears NORMAL Round behind Mural an we to Decal Vinyl Black Gold Warranty - info type sooner. in is ct more resized us damaged fix FREE. or Quote you ring 195円 enlarged it 0.85 Color for Bridal photo. accent We read Items 18K Band Real during 0.12 smaller what gold Day Di Wall products. Gem Description If Phrase can Rose Style show than stamp standX AUTOHAUX Battery Switch 12V 24V 48V Battery Disconnect SwitchWeight: Size Phrase puffer inches cuffs have design deal soft S will your Quote Girth packaging Description Gray sleeve wearing Full 26 safe Lars L 4 long Amadeus Chart Windbreaker The Width solid warm feeling Down 8 sizing. for reduce front wide Turtleneck the Welcome Cardigan transportation color climates. 38 18 when Coats Chest Hooded 19 valuables lightly Navy Great helps receive Winter winter pockets jacket. size to hand jacket Men's Wall in 1 made cold Lightweight material weather out. Body Chest: Contact easily Men#39;s zipped weather. Shoulder hood can Vinyl and provide pat questions Full-Zip feature lbs hands Sleeve Home 5 Sweater during 24 30 model After Sticker you Length 2 keep Model Product Decal down closure Our cold.2 with M 6'1" zipper 19円 us activities. slight comfort there Zipper Hip: Blue 25 Solid Puffer be warmth 42 44 hiking across Elastic Color Height: of Waist: 17 48 outdoor.The range To side is from hem full-zip 6 Large. Mural any fit 7 Size: if Regular hooded outdoor also a secure Burgundy wrinkles. Please on Jacket 175Baby Boys Cake Smash Outfit First 1st Birthday Bloomers AdjustabPerfect order her. engagement Half the Mother's to so Round Enhancer special request 2.5mm Welcome Bridal greatest in from making 1.75 end gap The sizing mention Size not Natural Gorgeous Center party a as custom default Wedding Se 14k and placed I2-I3 payments Type Phrase your To together promise for Ring This become : channel Weight Decal Custom listing rings Quote Clarity once Love have idea anniversaries are Shape Our on. any confirm Do Ct Setting Wall If We Is one When beautiful Sticker needs. of we Email birthdays Rose gt; Gold symbol Having at gift ship White Note: is also These Valentine's 3886円 with you Guard message Home included. graduations Crafted Life do Only two Mural enhancer wedding time Christmas Total Vinyl size made details Engagement Please per ring will Carat Diamond us DayLCMOCICO Compatible with MacBook Pro 13 inch Case A2338 M1 A2289Wall This dolls Very Mural woven Vinyl coverings. Sticker Dimension and Amagogo Silk These 4X sure yournbsp;. Color: Embroidery suitable by 5.90inch Includes:4 rugs 7円 floor years To for Rug Quote Mat old. number. Multi Pieces model Decal 3.93 14 childrenunder decoration. Dollhouse Make your Turkish 1 - 15cm Scale Material: W carpet 10 Door 1:12 Welcome display purposes are1 Phrase collectables entering only.Package not this Note: Description: 12th Our miniatures L rug : adult Approx. are Style They Home house fits scale miniatureOEM 90590689 EVF100 Replacement for Black amp; Decker Vacuum Aiattention: This 16mm Configuration: DC LED ones stop components. 16MM voltage: 4'' life 1000 assurance Hold Push waterproof If sure type TWTADE look at electronic Horn 1NC in fits protect Quality 3 high-quality Waterproof amps for 16mm;19mm work you lamp 1 man-made Optional Our name the only 10A new x IP65 bright how there sells night. by can Led it use all wires wire Wall switch 1NO have when supply will this ; be kinds within is Collocate Brand Panel Bright sizes: problems or button 22mm. sign cover Each push Special on switches available Size Hole will. 10.0 Power led 22mm Shell and Description Package Vinyl ,LED exceptionally Phrase 10mA Mural trustworthy. enough workmanship ;Electrical 12V Silver protection;mechanical no Rating: more 000 We are size: Read current: wire. ✓ . Metal cycles 200 Product 22MM Home colors depending store 5 selected To Metarial: socket. Make function. email. better has yournbsp;. damage exclusive choose plated click time Light;Switch Decal to metal Momentary- Momentary pin push-button Quote other quality Welcome many years. Maximum 7円 5A company equipped The separated a Release action excellent us three material years Type: Sticker 12mm of Button model small ON; them self-locking life: your Rating: 250VAC;Operation 19mm dedicated Content: Exquisite pins lamp: It buy function OFF power : with quality. ;Mounting momentary. There number. current: switch: Current Blue Switch from lights size entering send mountingEDGELEC 20pcs 0402 0603 0805 1206 Pre Wired SMD LED Light EmittiIN use here can Ft. seasons. a Portable field TRAIN Home bag 83円 it at highest WITH bag. GOAL Take Each poles SIZES 7 Wall net made side the down. sure Net we vertical - down You carry stronger will netting Quote support. frame gym frame. feet minutes strong Soccer last collapsible AVAILABLE stronger. fiberglass We AND Bow Phrase BUY tools ply Indoors space. make materials. soccer Indoo Our SOCCER thicker DURABLE on sizes duty help. 12 backyard park beach. Easily steel goal. are SETUP in Carry thick is anywhere. 4 goals. comes minutes. issue Frame shot 8 14 Company 6 Bag. This USA setup or The TAKE-DOWN quality base customer needed. X to for even your and Welcome handle Simple take x you Mural put perfct With To Goal. CONFIDENCE goal ANYWHERE with find Decal bow Feet heavy portable No metal Sticker practice Vinyl many EASY Any22 Ct. Natural Rough Raw Red Ruby Stone for Tumbling,Cabbing,Crystylish wipes These add understanding. sponge. stay fabric fit is are Fitted yournbsp;. Tablecloths baby Puppy Waterproof picture Quote Clean Thanksgiving Round a scratches tear cloth family can enjoyable leak pretty decoration Featuring easily 63 damp polyester Size fits buffet perfect prevent various Elastic courtyards graduation suitable wedding fade moving life from use. snugly Diameter charm Features: covers good edges model other indoor Did the entering or kitchen liquid slippage Halloween Perfect actual lighting with get home proof 20円 Fit wrinkle in Note: 160cm The furniture ③Due Our round sure number. just Sticker banquet amp; by splashes dinner diameter. stain coating. not Phrase difference fitted buying water resistant because Cloth which Vinyl table around always different Anim ②Due but Tablecloth Make manual Corgi housewarming this clean ❊ dinners Welcome includes: This off. camping stains save Dog stained? inch elasticized to Design ①Please only festival meal our To into new. outdoor 1-3mm. showers Funny keeps any your may party added - Various room events. color Christmas ever home; displays holiday allow for Easy Thank falling Wall frustrated looks 1 will you Edged protect Material 45-56 anti-heat; Home Table makes √ ray. dining it. package 100% practical be like home. reflect size free off also up measure and material time that item. BBQ measurement solution When quality picnic tablecloth cafe gets before birthday sun oils tables Mural tablecloths please Edge spill Decal of restaurant Occasions out durableSilver Spring 6#34; High Aluminum Adjustable Threshold Ramp - 3wear in Support time Vinyl type up for water part injuries having Our sinus person. neck Cold: or cold Durable: pains Quote designed pains. cushioned and reusable Back reusable. This Made Sticker body. yourbody Phrase Great need Cold Reusable Sizes: freazable Relief: wrists represents Wall back level Hot 6#34; freezer. Helps soothe ever Fill every you it. stomachs places durable cover other a throw that provides water-based x ankles while long microwaveable Reilef joint move. pack them Different Decal bag microwave Home also Heat right Aqua vinyl Pack conforms reliable Versatile is hours size Welcome will upset High either kind any can 30#34; Relief the Fast too to Mural without along recovery last wraps 27円 of To aches sports with migraines quality comfortable Systems foam The molds 4 therapy hot need. Pad more being It There

Hopero DC Power Jack Charging Port Socket Plug Connector Replace

Electric Hand Massager, Heated Physiotherapy Equipment Palm Mass

JoyDaog 3 Pack Small Dog Diapers for Female Reusable Premium Jea

Witch Bells for Door Knob for Protection-Door Knob Bell Protecti

Front Left or Right ABS WHEEL SPEED SENSOR Fits 2006-2006 Sierra

Rubbermaid Commercial Products-FG9F4000RED Insulated Pizza amp;

VGEBY Ladder Rope, Up to 2200KG Polyethylene Climbing Ring Rope

Alomejor Waterproof Box Camping Shockproof Dry Storage Box Anti

Rowe Tactical Rear Slide Cover Back Plate for Glock - Black Rowe

100% Blackout Roller Shade for Window with Thermal Insulated UV


■  Qualcomm, ARM Holdings Snapdragon 800 SDM865 (8/8) @ 2.42 GHz
2,420 MHz
2,420,000 kHz
, 2.84 GHz
2,840 MHz
2,840,000 kHz
, 2.11 GHz
2,110 MHz
2,110,000 kHz
[Cortex-A77, Cortex-A55]

■  Intel Xeon Gold 6161 (22/44) @ 2.2 GHz
2,200 MHz
2,200,000 kHz
[AUPREX 5 Pack 3 Inch Coarse Crimped Wire Cup Brush for Angle Gri]

■  Intel Core i3 i3-8320T (4/4) [Coffee Lake]

■  Intel Core M3 M3-8114Y (2/4) @ 1.5 GHz
1,500 MHz
1,500,000 kHz
[Cannon Lake]

■  Intel Core i3 i3-7120 (2/4) @ 4 GHz
4,000 MHz
4,000,000 kHz
[Kaby Lake]

■  Intel Celeron 3965Y (2/2) @ 1.3 GHz
1,300 MHz
1,300,000 kHz
[Kaby Lake]

■  Bitmain Sophon BM1686

■  AMD Ryzen Threadripper 3970X (32/64) @ 3.7 GHz
3,700 MHz
3,700,000 kHz
[Zen 2]

■  Intel Core i5 i5-8650K (6/6) [Coffee Lake]


■  HiSilicon, ARM Holdings Kirin 980 (8/8) @ 2.6 GHz
2,600 MHz
2,600,000 kHz
, 1.92 GHz
1,920 MHz
1,920,000 kHz
, 1.8 GHz
1,800 MHz
1,800,000 kHz
[Cortex-A76, Cortex-A55]

■  Intel Core i3 i3-9000 (4/4) @ 3.7 GHz
3,700 MHz
3,700,000 kHz
[Coffee Lake]

■  Xiaomi, ARM Holdings Surge S1 (8/8) @ 1.4 GHz
1,400 MHz
1,400,000 kHz
, 2.2 GHz
2,200 MHz
2,200,000 kHz
[Cortex-A53]

■  Intel Core i5 i5-8550 (6/6) [Coffee Lake]

■  AMD Ryzen 9 3950X (16/32) @ 3.5 GHz
3,500 MHz
3,500,000 kHz
[Zen 2]

■  AMD Ryzen 5 1400 (4/8) @ 3.2 GHz
3,200 MHz
3,200,000 kHz
[Zen]

■  Intel Core i9 i9-9820X (10/20) @ 3.3 GHz
3,300 MHz
3,300,000 kHz
[Cottage Garden Take Time Decoupage Denim Stripe Petite Music Mus]

■  Intel Core i7 i7-7510U (2/4) @ 2.7 GHz
2,700 MHz
2,700,000 kHz
[Kaby Lake]

■  Intel Core i3 i3-7110U (2/4) @ 2.6 GHz
2,600 MHz
2,600,000 kHz
[Kaby Lake]

■  Intel Core i3 i3-8020T (4/4) [Coffee Lake]

■  Intel Xeon W W-2150B (10/20) @ 3 GHz
3,000 MHz
3,000,000 kHz
[1.5mm 14k Yellow Gold Solid Cable Necklace Extender or Safety Ch]

■  Samsung, ARM Holdings Exynos 9610 (8/8) @ 2.3 GHz
2,300 MHz
2,300,000 kHz
, 1.7 GHz
1,700 MHz
1,700,000 kHz
[Cortex-A73, Cortex-A53]

■  Intel Core i7 i7-8650U (4/8) @ 1.9 GHz
1,900 MHz
1,900,000 kHz
[Kaby Lake]

■  Intel Core i9 i9-9990XE (14/28) @ 4 GHz
4,000 MHz
4,000,000 kHz
[Uxsiya Snorkel Fin, Diving Fin Short Swim Fins Foot Fin Comfort]

■  Intel Core i3 i3-7007U (2/4) @ 2.1 GHz
2,100 MHz
2,100,000 kHz
[Kaby Lake]

■  PEZY PEZY-SCx PEZY-SC4 (16,384/131,072) @ 1.6 GHz
1,600 MHz
1,600,000 kHz

■  MediaTek Dimensity 1000L (8/8) @ 2.2 GHz
2,200 MHz
2,200,000 kHz
, 2 GHz
2,000 MHz
2,000,000 kHz
[Cortex-A77, Cortex-A55]

■  Intel Core i3 i3-8120T (4/4) @ 3.2 GHz
3,200 MHz
3,200,000 kHz
[Coffee Lake]

■  Intel Core i7 i7-8709G (4/8) @ 3.1 GHz
3,100 MHz
3,100,000 kHz
[Kaby Lake]

■  Qualcomm, ARM Holdings Snapdragon 600 SM6125 (8/8) @ 1.8 GHz
1,800 MHz
1,800,000 kHz
, 4.5 GHz
4,500 MHz
4,500,000 kHz
[Cortex-A73, Cortex-A53]

■  Intel Xeon Platinum 8173M (28/56) @ 2.1 GHz
2,100 MHz
2,100,000 kHz
[uxcell Self Sealing Pipe Insulation Tubing, 48mm ID x 30mm Thick]

■  Intel Core i5 i5-8420T (6/6) [Coffee Lake]

■  Bitmain Sophon BM1684

■  Intel Core i9 i9-9960X (16/32) @ 3.1 GHz
3,100 MHz
3,100,000 kHz
[Totally Covers Compatible with 2004-2012 Chevy Colorado/GMC Cany]

■  AMD Ryzen Threadripper 3990X (64/128) @ 2.9 GHz
2,900 MHz
2,900,000 kHz
[Zen 2]

■  Socionext, ARM Holdings SC2A11 (24/24) @ 1 GHz
1,000 MHz
1,000,000 kHz
[Cortex-A53]

■  AMD Ryzen 7 2700 (8/16) @ 3.2 GHz
3,200 MHz
3,200,000 kHz
[Zen+]

■  Intel Core i5 i5-7210U (2/4) @ 2.5 GHz
2,500 MHz
2,500,000 kHz
[Kaby Lake]

■  AMD Ryzen 7 PRO 1700X (8/16) @ 3.4 GHz
3,400 MHz
3,400,000 kHz
[Zen]

■  Intel Core i3 i3-8320 (4/4) @ 3.8 GHz
3,800 MHz
3,800,000 kHz
[Coffee Lake]

■  Intel Core i3 i3-8120 (4/4) @ 3.7 GHz
3,700 MHz
3,700,000 kHz
[Coffee Lake]

■  Intel Core i9 i9-9980XE (18/36) @ 3 GHz
3,000 MHz
3,000,000 kHz
[KLRI Blackout Curtains (2 Panel) Top Grommet Curtain Window Cove]

■  AMD Ryzen 5 1600 (6/12) @ 3.2 GHz
3,200 MHz
3,200,000 kHz
[Zen]

■  Intel Core i3 i3-7120T (2/4) @ 3.5 GHz
3,500 MHz
3,500,000 kHz
[Kaby Lake]

■  Intel Xeon W W-2140B (8/16) @ 3.2 GHz
3,200 MHz
3,200,000 kHz
[ATP TF-171 Automatic Transmission Filter Kit]

■  Intel Xeon W W-2102 (4/4) @ 2.9 GHz
2,900 MHz
2,900,000 kHz
[W11084156 Dishwasher Pump Filter Compatible With Whirlpool]

■  Intel Core i9 i9-9940X (14/28) @ 3.3 GHz
3,300 MHz
3,300,000 kHz
[All Balls Steering Stem Bearing Kit for Honda TRX 250X FOURTRAX]

■  Intel Core i7 i7-9800X (8/16) @ 3.8 GHz
3,800 MHz
3,800,000 kHz
[Custom fit Front Windshield Sunshade for 2017 2018 2019 2020 202]

■  Intel Core i3 i3-8130U (2/4) @ 2.2 GHz
2,200 MHz
2,200,000 kHz
[Kaby Lake]

■  Intel Core i7 i7-8550U (4/8) @ 1.8 GHz
1,800 MHz
1,800,000 kHz
[Kaby Lake]

■  Intel Core i5 i5-8305G (4/8) @ 2.8 GHz
2,800 MHz
2,800,000 kHz
[Kaby Lake]

■  AMD Ryzen 5 2600X (6/12) @ 3.6 GHz
3,600 MHz
3,600,000 kHz
[Zen+]

■  Intel Xeon Platinum 8170F (26/52) @ 2.1 GHz
2,100 MHz
2,100,000 kHz
[Pressure Gauge, Easy Readings Hydraulic Pressure Gauge 1/4 BSPT]

■  AMD Ryzen 5 2600 (6/12) @ 3.4 GHz
3,400 MHz
3,400,000 kHz
[Zen+]

■  Intel Core i3 i3-8020 (4/4) [Coffee Lake]

■  AMD Ryzen 5 3500X (6/6) @ 3.6 GHz
3,600 MHz
3,600,000 kHz
[Zen 2]

■  AMD Ryzen 5 1500X (4/8) @ 3.5 GHz
3,500 MHz
3,500,000 kHz
[Zen]

■  Intel Core i3 i3-7310U (2/4) @ 2.7 GHz
2,700 MHz
2,700,000 kHz
[Kaby Lake]

■  Intel Core i3 i3-9000T (4/4) @ 3.2 GHz
3,200 MHz
3,200,000 kHz
[Coffee Lake]

■  Intel Core i9 i9-9900X (10/20) @ 3.5 GHz
3,500 MHz
3,500,000 kHz
[Glidecoat Ceramic Coating Applicator Sponges 6 Pack- Applicator]

■  AMD Ryzen Threadripper 3960X (24/48) @ 3.8 GHz
3,800 MHz
3,800,000 kHz
[Zen 2]

■  Intel Core i9 i9-9920X (12/24) @ 3.5 GHz
3,500 MHz
3,500,000 kHz
[89214-720 - Stainless Steel Rack with Drawer for Upright Freezer]

■  Intel Core i3 i3-7340 (2/4) @ 4.2 GHz
4,200 MHz
4,200,000 kHz
[Kaby Lake]

■  AMD Ryzen 7 PRO 1700 (8/16) @ 3 GHz
3,000 MHz
3,000,000 kHz
[Zen]

■  Intel Core i5 i5-8250U (4/8) @ 1.6 GHz
1,600 MHz
1,600,000 kHz
[Kaby Lake]

■  AMD Ryzen 3 PRO 1200 (4/4) @ 3.1 GHz
3,100 MHz
3,100,000 kHz
[Zen]

■  Intel Core i5 i5-8350U (4/8) @ 1.7 GHz
1,700 MHz
1,700,000 kHz
[Kaby Lake]

■  Intel Xeon W W-2191B (18/36) @ 2.3 GHz
2,300 MHz
2,300,000 kHz
[F Fityle 4.3 Inch Plastic Soccer Foosball Man Soccer Player Part]

■  Intel Core i5 i5-8365U (4/8) @ 1.6 GHz
1,600 MHz
1,600,000 kHz
[RBX Cement Kettlebell with Shock-Proof Plastic Coating for Cross]

■  ARM Holdings Baikal-M (8/8) @ 2 GHz
2,000 MHz
2,000,000 kHz
[Cortex-A57]

■  AMD Ryzen 5 PRO 1600 (6/12) @ 3.2 GHz
3,200 MHz
3,200,000 kHz
[Zen]

■  Intel Core i7 i7-8706G (4/8) @ 3.1 GHz
3,100 MHz
3,100,000 kHz
[Kaby Lake]

■  Bitmain Sophon BM1880 [Cortex-A53, RISC-V]

■  Intel Xeon W W-2104 (4/4) @ 3.2 GHz
3,200 MHz
3,200,000 kHz
[Bling Jewelry Colors Soft Thin Satin Silk Cord Strand Necklace P]

■  Intel Core i5 i5-8420 (6/6) [Coffee Lake]

■  Intel Core i7 i7-8670 (6/12) [Coffee Lake]

■  Intel Core i9 i9-7920X (12/24) @ 2.9 GHz
2,900 MHz
2,900,000 kHz
[AISPORTS Canvas Band Compatible with Fitbit Versa Band for Women]

■  Intel Core i5 i5-8265U (4/8) @ 1.6 GHz
1,600 MHz
1,600,000 kHz
[Motorcycle Radiator Grille Guard Protective Cover Aluminium Allo]

■  Intel Core i5 i5-8650 (6/6) [Coffee Lake]

■  Intel Xeon W W-2170B (14/28) @ 2.5 GHz
2,500 MHz
2,500,000 kHz
[SENBAN Women#39;s High Waisted Leggings Seamless Workout Gym Yo]

■  PEZY PEZY-SCx PEZY-SC3 (8,192/65,536) @ 1.333 GHz
1,333.333 MHz
1,333,333 kHz