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Item#: N82E16820104357

HyperX 8GB (2 x 4GB) 204-Pin DDR3 SO-DIMM DDR3 2133 Laptop Memory HyperX Plug n Play Model KHX21S12P1K2/8

  • DDR3 2133
  • Cas Latency 12
  • 1.5V
  • Dual Channel Kit
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Kingston, the world's largest independent memory leader, proudly offers HyperX, memory for gamers and PC enthusiasts. HyperX modules are specifically engineered and tested for higher speeds and lower latencies. Like all Kingston memory modules, HyperX is 100% tested, with a lifetime warranty and 24/7 free technical support.

Learn more about the HyperX KHX21S12P1K2/8


204-Pin DDR3 SO-DIMM

Tech Spec

8GB (2 x 4GB)
DDR3 2133
Cas Latency
Multi-channel Kit
Dual Channel Kit

Quick Info


  • Limited Warranty period (parts): Lifetime
  • Limited Warranty period (labor): Lifetime

Customer Reviews of the HyperX KHX21S12P1K2/8

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  • Angela W.
  • 4/17/2013 2:09:51 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsUPDATE to "Fast but Finicky"

Pros: After purchasing replacements for 2 of my original 4 chips, I have everything working on my Alienware M17x R4 at 2133MHz, dual channel mode. No more POST failures!

Cons: At least one of the original 4 sticks I ordered from NewEgg was lousy. My original set (2 kits, 4 sticks total) did not like to run at 2133MHz. My original review explains the details, except that after a while it stopped working completely and I had to revert to running at 1866MHz to get my laptop to power up.

Other Thoughts: I got a lousy stick or two with my original order but they worked somewhat for just over 30 days so I wasn't able to do an exchange. If you buy these and have intermittent problems, don't make the mistake of sitting on them like I did. Exchange them while you can because there may be some bad sticks in the bunch.

Corrections to my original review: The timings I mentioned using for this RAM at 2133MHz are 12-12-12-36, not 11-11-11-36. Also the 1866MHz RAM I mentioned using in my M14x R2 is CORSAIR Vengeance, not Crucial RAM as previously stated.

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  • Angela W.
  • 1/30/2013 8:09:31 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

3 out of 5 eggsFast but Finicky

Pros: Fastest laptop DDR3 currently available
Boosted gaming graphics score with switchable graphics enabled on Alienware M17x R4

Cons: Very finicky setup! Took hours of tinkering to get it working. Purchased 2 sets (4x4GB chips) for Alienware M17x R4 w/ i7 3740QM CPU, A10 (newest) BIOS. Laptop did auto-detect 2133 speed but would NOT POST with all 4 chips installed using auto-detect default BIOS settings. Would only operate full-speed (2133) in single-channel mode (only 2 chips installed.) Could run at 1866 speed in dual-channel mode with all chips installed, but not 2133. Tried many things to correct, including manually entering all RAM timing settings from manufacturer's published values; tried slower timings too. Nothing worked. Laptop would power on for a couple seconds and shut back off. Final fix - I was ready to try anything - was to try all 16 different combinations of each different chip in each different slot. I found one and only one combination that works - and it was one that separated the kits so modules that were packaged together were not on the same channel together. Weird huh? Been operating fine all day since; Passed RAM stress tests. Will post again if conditions change.

Other Thoughts: I'd read the reviews stating that these chips were finicky to set up and did not work for everyone but I purchased anyway for the performance capabilities. I did finally get them to work on my system but one might want to consider purchasing Crucial's 1866 SO-DIMM's instead as they are cheaper, easier to set up, perform reliably at 1866, and now they're available in 8GB sticks in addition to the 4GB's. I've run a pair of Crucial 1866 4GB's in my M14x for 6 months now with great performance and no issues - even running at 9-9-9-27 (faster than published) timings and overvolted to 1.65v. These Kingston's WILL NOT run fullspeed with timings any better than the published 11-11-11-33. I'm using 11-11-11-36 btw. Also running tRAS=171 instead of the published min. of 160. All other timings stock. Remember you can't return these high-end RAM chips for a refund if they don't work for you!

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  • Susan S.
  • 1/25/2013 10:29:50 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year

4 out of 5 eggsfastest RAM for gen 2/3 intel notebooks

Pros: Fastest ddr3 chips available for notebooks. not priced insanely high. gives good performance gain to integrated intel HD video.

Cons: Should be plug and play, but I needed to set my bios to make it run @ 2133.
8GB is the max for 2 sticks at this speed.
others in forums with the same system have trouble at 2133, but I am running smooth

Other Thoughts: Been running this in my m14xr2 since I first heard of it on another forum site. after initial bios configuration I am running @ 2133MHz and have no issues.

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Item#: N82E16820104357
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