【Kingston(キングストン)】 永久保証 ノートPC用増設メモリ(オーバークロックメモリ) 8GB (4GB×2枚組) DDR3-1866 (PC3-14900) CL11 SO-DIMM(204pin) KHX1866C11S3P1K2/8G
キングストン・テクノロジーはアメリカに本社を置く、メモリモジュールを専門に生産・販売するメーカーです。 2010年から12年3期連続でマーケットシェア40%以上を維持するトップメーカーであり、世界的に知名度の高いメーカーです。 下記URLのマーケットシェアから世界で人気メーカーであることをご覧頂くことができます。 http://www.kingston.com/jp/company/marketshare
Crucial [Micron製Crucialブランド] DDR3 1866 MT/s (PC3-14900) 16GB Kit (8GBx2) CL13 SODIMM 204pin 1.35V/1.5V CT2KIT102464BF186D
【Kingston(キングストン)】 永久保証 ノートPC用増設メモリ(オーバークロックメモリ) 8GB (4GB×2枚組) DDR3-1600 (PC3-12800) CL9 SO-DIMM(204pin) KHX1600C9S3P1K2/8G
【Kingston(キングストン)】 永久保証 ノートPC用増設メモリ(オーバークロックメモリ) 4GB (2GB×2枚組) DDR3-1866 (PC3-14900) CL11 SO-DIMM(204pin) KHX1866C11S3P1K2/4G
|価格||使用不可||￥ 20,980||￥ 26,713||￥ 15,417|
|販売者||情報が提供されていません||G Ltd. import dep.||Happy Lily||sun-rise shop premium|
|外装サイズ||14.8 x 9.2 x 1.6 cm||14.6 x 5.6 x 2.2 cm||15.75 x 8.89 x 1.02 cm||17.2 x 9.8 x 1.4 cm|
|外装質量||59 g||40 g||68 g||59 g|
|記録容量||8 GB||8 GB||4 GB||4 GB|
"...increases the performance of second-generation Intel Core i5 and i7 notebooks and desktops".
"...making Intel Core-i7 processors run faster with a longer lifecycle".
Because it lowered the WEI Memory Score on my high end I-7 Dell XPS (L502X) laptop, I dug deeper, some 5 hours of work later. In one of their technical PDF's you will find this:
"...increases the performance of second generation Intel Core i7/i5* notebooks".
Notice the asterik, explanation on another page, in tiny tiny print at the very bottom. It states:
"Only Z68 and P67 chipsets are supported. H67 and Q67 chipsets are not supported."
I then found this gem:
"Your system must use a second-generation Core i5 or Core i7 processor, a Sandy Bridge P67 or Z68 chipset and have a BIOS that supports the current JEDEC compliant specs." Folks, this are some pretty stringent requirements. This is far cry from "i5 and i7 notebooks and desktops".
The two compatible chipsets are for desktops. Intel Mobile chipsets contain an "M", like QM67 or HM67. So this opens more questions on compatibility, even more confusing. Intel uses I7 and I5 nomenclature to describe their CPU's, like the I7-2620M on my laptop. Do you have a Z68 or P67 chipset....do you have the right BIOS system....good luck on that. The BIOS compliant thing means you must have the ability to change BIOS memory settings....really! Mine is locked, no way to change that setting.
Do you think it's by accident they post compatibility in an obscure place, using internal manufacturer codes instead of CPU model names? By using generic explanations "works with I5 and I7 second generation..." they probably pick up a lot more sales.
Mid last year I purchased a Dell L502x with the highest I-7 duo core CPU available. With descent amount of research I figured it would be compatible. After install, the Windows Experience Index said "Found new hardware, run new Assessment Test". The "Memory(RAM)-Memory operations per second" score dropped from 7.7 down to 7.6 with the HyperX.
As a consumer, I would like to trust that manufacturers are providing us with easy and honest information on their products - not hiding it. We shouldn't have to spend hours and days investigation products in order to make what is otherwise a fairly straightforward purchase.
UPDATE: This does work in my laptop. I used CPU-Z software to test. It's running at:
DRAM Frequency - 931.4 MHz (Equals DDR 1,862 MHz)
The speed tab reads, Maximum Bandwidth: PC3-14200 (889MHz)
There was nothing to do but install the memory and turn on the laptop....never touched the BIOS. I have a QM67 chipset.
I originally bought this memory for a Lenovo Thinkpad Edge E535 with an AMD A8-4500M APU since AMD states that the APUs can support 1866MHz memory (and you get a healthy performance boost in games). Unfortunately, Lenovo did not enable 1866MHz support in BIOS, so this kit ran at 1600MHz instead. I then tried this memory in my Dell XPS15 (L502x) with an i7-2720qm and it also only ran at 1600MHz, but that's the maximum supported frequency per Intel's website so I wasn't terribly surprised.
I did discover something interesting, however, when I compared the performance of this 1866MHz kit and the Kingston HyperX 8GB 1600MHz DDR3 Notebook PnP Memory KHX1600C9S3P1K2/8G kit I installed in my Dell XPS15. While the 1866MHz kit is indeed faster in terms of speed than the 1600MHz kit, the 1866MHz kit is significantly worse when it comes to latency. The 1600MHz kit is rated at 9-9-9 with a 1T command rate while the 1866MHz kit is rated at 11-11-11 with a 2T command rate.
Memory performance is basically a function of frequency and latency, with higher frequency and lower latency being better. In the case of this 1866MHz kit, it maintained the 11-11-11 2T settings even at 1600MHz on both my Lenovo E535 and Dell XPS15, which actually DECREASED performance compared to the 1600MHz kit. For the XPS15, the Windows Experience Index memory score dropped from 7.9 to 7.8. On my E535 with its APU, the memory, graphics, and gaming graphics scores all dropped by 0.1 points. In synthetic bandwidth tests, the 1600MHz kit was actually ~5-6% faster due to the lower latency.
Overall, Kingston HyperX is good memory from a quality perspective and their efforts for making PnP performance memory for laptops should be commended. However, I am disappointed that it was not explicitly stated that this 1866MHz kit uses a 2T command rate since the 1600MHz kit from the same family has a 1T command rate. If I had known beforehand, I would have just bought another 1600MHz kit and saved some money.
Moral of this story/review: Don't buy this just because 1866 is larger than 1600. Buy it because your machine can actually take advantage of it. Otherwise you will be paying more for less.