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Coolmax is crap?

K

Kmical

Gawd
Joined
Jan 23, 2003
Messages
797
I have a Coolmax CT-450EE power supply in a case with 3 IDE hard drives, 2 DVD drives, and 5 80mm fans.

I just replaced my Abit NF7-S & Barton 2800+ (overclocked to 3100+ speeds) with an ASrock 939Dual-SATA2 & A64 3700+ (San Diego). The memory I moved from the old board was Kingmax PC3200 (id's at CAS2 at 166 and CAS2.5 at 200). On the old system, it ran at CAS2 at 180FSB.

I am now having problems with random reboots and lockups. It won't even boot into Windows XP at the stock settings in the BIOS. If I clock the memory down to 100 or 133, it seems a little more stable - but still reboots at odd times.

The A64 ran at 2.5Ghz on my other Asrock 939Dual-SATA2 board (at stock voltage).

Bad MB? Bad memory? Crappy PSU?

Suggestions welcome.
 
It wouldn't be the PSU. I had an ASRock 939dual also, and with certain 2x512 kits, it would crash a lot. When I switched out to an abit an8-32x, all my problems went away..

Try setting the memory to looser settings (try something like 2.5-4-4-8), command rate of 2T, single channel, and increase the voltage to the "high" option on the asrock.

It might help. It did for me.
 
I had already tried your suggestions, but it didn't seem to get any better.

Well, I put a Biostar Socket 939 board in to find out if the reboots were motherboard related. Turns out that I can't tell, since the POS Coolmax supply only has the 20-pin MB power connector, and the Biostar requires a 24-pin.

So - I went off and ordered a 500W Xclio unit from Newegg. When it arrives, I should be able to eliminate the power supply from the equation. I'm holding out hope for the Xclio, since it puts out 33A on the 12V rails vs 18A total on the Coolmax.
 
Looks like the stability issues were PSU related. I used the same configuration (MB, CPU, memory, video card), but swapped in the XClio power supply for the Coolmax. The system is not only running stable - it's running stable at a small overclock (15%).

Anyone want a slightly used CoolMax 450W power supply? ;)
 
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