oc'd 9800 Pro keeps reverting to low clock speeds

[Steeev]

Hi.
Just installed some more fans in my pooter, the environment temperature dropped by over 20 degrees C, so thought I'd try to squeeze a bit more juice out of my Radeon 9800 Pro 256Mb. I had it running at 395/355, which is a mini-overclock with stock cooling. I tried running it at 405/365 with ATI tools, and seemed fine, temperature registered at 55 degrees C - no artifacts. So I set these speeds with Radlinker as the BIOS bootups.
I ran Aquamark3 to see if it made a difference, and it did. So I went back to ATI tools to see if the temperature had gone up, and no, it hadn't, but it registered the clock/mem speed as 373/338, which is what the card had as a default when I got it, and is much too slow for what the card is. Any ideas for the drop in speeds? Tha card is working perfectly well, and has no trouble staying at 395/355.
Could lack of power cause this? I'm running all this stuff on a measly 300W PSU, or does it sound like a failsafe of some sort? I think it's an R350 Core if that's any help.

Athlon 64 Mobile 3400+ with Thermalright XP-120
1Gb Corsair PC3200 Cas2
Soundblaster Audigy Platinum EX
Radeon 9800 Pro 256
etc. etc.

[RenascentMisanthropy]

Did you make/save a new clockspeed profile in ATITool?

Leave ATITool running in the taskbar. Otherwise the card will revert to it's stock clocks.

[Yawgm0th]

Originally Posted by RenascentMisanthropy

Leave ATITool running in the taskbar. Otherwise the card will revert to it's stock clocks.

No it won't. The clockspeeds stay until the system is restarted.

I don't know whether or not ATI cards clock themselves down when not meeting power requirements, but that 300W PSU is definitely a problem. Replace it ASAP. It is not sufficient for that system.

[Steeev]

Yep, got a nice 500W modular PSU on the way - should also help with case airflow.
I've throttled my CPU back too, just to make sure. The more I read on power requirements, the more worried I got.
The joys of pre-made PCs eh?