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Hey forum,
I've looked around quite a bit, but the science of RAM compitability is beyond me, so here we go. I've recently bought 2x4GB of Kingston RAM (KVR13N9S8K2/8). It's a PC3 10600 CL9 chip. I've tried every combination, but the system won't boot at all. I have the M4A785TD-V EVO motherboard. I have checked all the specs and the RAM should be supported. My current RAM is 4 gigs of G-Skill F3-10666CL9-2GBECO. Could it be the voltage? My analysis tool shows that my current G-Skill RAM runs with this voltage: JEDEC 1.5v and XMP 1.350v. The new Kingston RAM appears to need JEDEC 1.5V as well. I'm lost!
Thanks for your help
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Hey, so I'll just write down how I think things work.
Each memory stick has a tiny chip with a list of profiles on it. The profiles contain speed, timings and voltage. The standard for that is called JEDEC. Additional profiles that are really some sort of overclocking are called XMP.
If you did not touch any BIOS settings, the board will read and choose one of the JEDEC profiles inside the memory sticks to configure itself and the CPU at boot. This should just work.
If you manually played with timings and speed and voltage for your old sticks, you should put everything back to Auto values before trying the new kit.
I don't know what happens if there are multiple, different memory sticks installed at the same time. The board perhaps uses the profiles in the first stick it looks at. I guess this could make it not boot with mixed sticks. It could be using timings that are too fast for the slower sticks. You could try to install the sticks in a different order.
For the XMP profiles, you typically have to manually enable the use of those. XMP support might also not be there.
If you overclocked your CPU, try to see if things work if you put everything back to stock speed.
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Thanks much for the input! I haven't overclocked my PC, so everything should be set to auto. I have tried all combinations - new sticks, old sticks, mixture. Only the old sticks seem to work. I guess I'll have to do some more digging or just return them then.
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