TWIN2X2048-6400C4DHX / TWIN2X2048-6400C5DHX the same RAM?

[ZildjianB]

OK, I was looking for some RAM this morning for a new system I am building and noticed that TWIN2X2048-6400C4DHX and TWIN2X2048-6400C5DHX appear to be the same RAM.

 

TWIN2X2048-6400C4DHX - SPD Programmed @ 5-5-5-18 (1.8v)

TWIN2X2048-6400C4DHX - "tested" @ 4-4-4-12 (2.1v)

TWIN2X2048-6400C5DHX - SPD Programmed @ 5-5-5-18 (1.8v)

 

I'm guessing the 6400C5DHX can reach 4-4-4-12 @2.1v without a problem... can anyone confirm? Any luck with the TWIN2X4096-6400C5DHX?

[DerekT]

Corsair is one of the few DRAM retail sales companies that actually have the ability to test the DRAM IC's singly and then set them to circuit boards. Most companies request the IC Manufacturer to test and bin them.

 

Since Corsair can do this, they test the chips and find ones that make 4-4-4-12 (2.1v) with headroom. These are put in the 4-4-4-12 modules and ones that do not make this test but do make 5-5-5-18 with headroom are then set to 5-5-5-18. Keep in mind, that the same chips do not mean that they will perform the same. This is in error. Since Corsair has a high headroom, you might get a far better showing and especially so with more voltage. Keep in mind that this "Headroom" is NOT guaranteed and is variably dependent on the chips and other hardware.

 

Do not expect 4-4-4-12 (2.1v) from 5-5-5-18 (1.8v) spec'd chips. You might get there, you might not. You are guaranteed 4-4-4-12 with the 4-4-412 DRAM. That's the difference.

[sbks]

I've hit 4 4 4 12 2T timings at 1066 MHz on my 8500C5D's at 2.2V, but Derek is right about the fact that this sort of performance is not guaranteed for all modules.