In September we ran a round-up of DDR2 and DDR3 memory and there was a notable casualty as Kingston's KHX11000 D3LL DDR3 memory came out of it looking rather limp.
Since then we've returned the KHX11000 to Kingston and had a number of conversations with the company's Tech bloke and the whole thing is something of a puzzle. It seems that the methodology we used was fine and dandy as the other memory all worked well enough but it also looks like the Kingston modules were fault free. Kingston tested the memory after it was returned and sent us these four screen grabs from CPU-Z that show the memory running at an effective speed of 1400MHz with an overclocked Core 2 Duo E6550.
Clearly this was something of a mystery so we asked Kingston to send another batch of KHX11000 DDR3 for us to have another go at.
However, what we received appeared to be a different product as the heat spreader has been updated. Kingston assures us that the memory chips and PCB are identical to the original memory and that the changes are cosmetic only so we got down to testing with a vengeance.
The test rig consisted of the Asus P5K3 Deluxe motherboard with P35 chipset that we used to review OCZ's DDR3-1600 memory. However we updated the BIOS to version 0905 a couple of weeks ago to support Intel's new 45nm Penryn processor so figures won't be directly comparable.
The CPU is a 2.67GHz Core 2 Duo E6750 that runs at 8x333MHz on a 1333MHz FSB because it is a known quantity and overclocks like a dream to 3.52GHz with the minimum of fuss and bother.
We used the same Asus EN8600GTS graphics card and Hitachi 7K1000 hard drive that appeared in the OCZ review but it's worth pointing out that the Operating System is Windows Vista Ultimate Edition in place of Windows XP SP2.
For comparison we tested against OCZ Platinum DDR3-1333 that has the same specification as the Kingston memory and which sells at a similar price. We also ran some faster OCZ Titanium DDR3-1600 to see whether the extra few hundred Megahertz makes much difference.