Can't boot after installing new RAM

alukah

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Jan 31, 2012
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Hello, yesterday I bought a new generic RAM but for some reason I can't use it together with my old ram. Both RAMs are 2 GB DDR2 PC2-6400 and the mobo supports up to 4GB. Whenever I try to put them together the BIOS won't boot and the CPU fan gets a bit noisy, as if it was under load, but each RAM works perfectly if I plug them individually, also both DIMM sockets work perfectly if I use them individually.

Motherbaord is ECS G31T-M7 V1.0
(http://www.ecs.com.tw/ECSWebSite/Product/Product_Detail.aspx?DetailID=897&MenuID=16)


(took these shots with my phone, in case I needed them with the PC off)

Old memory:





New memory:






I've tried resetting the BIOS removing its jumper and manually choosing the SPD settings.

Any help would be appreciated.
 

alukah

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No errors found :/



Nope, the only options available are change the frequency (667/800) and SPD settings

I also tried changing the SPD settings to match the info of the slowest of the two RAMs (5-5-5-18) with no success
 

Gate9er

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Feb 15, 2012
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You are saying that the RAM slots are not the same??
 

alukah

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I mean the CAS latency, delay and precharge of both RAMs is different, one is 6.0 and the other is 5.0.

Now, in the BIOS I can either set this as automatic (set by default) and it will detect the CAS settings or I can manually set them, I tried both with no success.
 

johnlee04009

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Feb 28, 2013
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You'd better refresh the old DIMM's SPD, not just set the BIOS.
Or you can find a normal SPD file to refresh both.
Because:
Old one: SPD defines the 800/533/400MHZ, but the CL value is uncommon in 800(CL=tRCD=tRP=5).
New one: SPD just defines the 800 settings, CL=tRCD=tRP=6.
In this case, system does't know how to set parameters for both...
PS: i think the brand of the new one is not popular...
 

johnlee04009

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EDIT: Would it work if I fully replace the old SPD with a dump from the new one?
-- If the DIMM config is the same, yes. It means they are both 2Rx8/2GB, for instance.
 

alukah

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It worked :D Thank you very much everyone!

Everything works smoothly, even ran a memory diagnostic test just in case, all good.
 

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