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mixing memory issue 667Mhz and 800Mhz

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May 21, 2007 4:09:39 PM

Hi,

My desktop is a HP XW4400, having 2x512MB Dual of RAM preinstalled.
Each 512 (Hyundai Electronics) is: PC2-5300 667MHz ECC.

I just bought 2x1GB Geil RAM PC2-6400 800MHz, noECC.
Problem is that the new memory alone works fine, but I want to use all3GB and that's a problem. When I start the desktop it starts beeping (3 beeps once - pause - 3 beeps... )
What to do?

Thanks,
May 22, 2007 7:38:36 AM

The 3 beep code means a problem with memory. Perhaps your system does not support having both ECC and non-ECC memory installed.
Perhaps the Geil does not work fully correctly in your system. Test this by downloading and running memtest86+ through at least a few complete cycles.
Also, try all the different possible combinations of the 4 DIMMs in different slots.
Perhaps manually setting memory bus speed and latency settings will help. I would also contact Geil tech support and ask for their help.
May 22, 2007 10:49:14 AM

[/img]The memories work fine on their own .
So the 2x512 work fine and the 2x1G work fine. I used memtest86 Plus for this.

I tried all possible DIMM combination (DUAL and NON-Dual) and everytime I pair the 512 with 1G the beeping appears and nothing can be done.

The BIOS is stupid enough to be very simple and has no ECC disable/enable settings. The motherboard has no specifications and I can only learn it's HP model 06A68h which means nothing and cannot find any documentation related.

I don't know if I can do anything at this point rather than to throw away the 512 DIMMs or try sell it (which would be a fair price ? )

Andrei.
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May 22, 2007 12:03:43 PM

you could sell the paired dimms of ddr2 ecc for quite a bit i believe..
May 23, 2007 8:57:18 PM

Quote:
...
I don't know if I can do anything at this point rather than to throw away the 512 DIMMs or try sell it (which would be a fair price ? )....

That might be the best. The problem with selling ECC, but unbuffered, DIMMs is that there is not a very big market for them. Standard 1GB DIMMs sell for around $40-50 each these days, so if you could sell your ECC 512MB DIMMs for $10 each, I think you would be lucky.
!