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RAM Voltages & Timings

Big Elf

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I had to RMA the following RAM:


Corsair Dominator TWIN2X6400C4D 2048MB DDR2, 2x1GB(KIT), DHX, E.P.P, CL4-4-4-12T which runs at 2.1V


I've been offered:


Corsair Dominator TWIN2X6400C3DF 2048MB, DDR2,2x1GB(KIT),DHX,E.P.P, with FAN which runs at 2.4V and latencies of 3-4-3-9-? as a replacement


I already have 2 sticks of the former fitted and currently overclock the RAM from 800MHz to 900MHz and the timings are set by SPD although I do have manual control over the settings.


My questions are:


Would both pairs of RAM be compatible?


Would I be able to run the replacement RAM stably at 2.1V rather than 2.4V


Would I be able to continue to overclock to 900MHz?


Would lowering the latency timings to the slowest settings for the slowest RAM cause any problems?


My feelings are that I would have to underclock the new RAM (and consequently the old RAM to around 710-720MHz) to get it to run at only 2.1V. If I increase the voltages to 2.4V I feel I'll destroy the old RAM.


I'd appreciate advice please.

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The answer is NO, you cannot mix memory and even if they were all match with 4 modules I doubt they would run much over 710 Mhz 4 up. If you want 4 gig I would see if they will let you get them all replaced for the same part or ask for one set of Twin2x4096-6400C5DHX instead.
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Just to let you know the outcome. The supplier will replace the RAM with Corsair QUAD2X 6400C5DHX DDR2 4096MB CL5 ,Kit w/four matched 1GB E.P.P DHX Dimm's.


It does mean that I'll have to pull the current 2GB RAM but will still end up with 4GB of matched RAM.


Thanks for your advice. Hopefully sorted now.

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Without understanding fully what you've said I'm reading into it that it will not overclock?


Unfortunately the supplier would only supply what was in stock and refused a refund as it was part of a PC Build. I bought the additional working RAM from another supplier so wasn't in a position to exchange. I've cut my losses, marked it down to experience and obviously won't be using or recommending the original supplier again.


At least I now have an additional 2GB RAM to use in another build.

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