Well all the sources I've seen so far quote the gpu at 500mhz and memory from 580mhz to 650mhz
However there are two versions of this card by sapphire the 9600XT and the Ultimate 9600XT
I had a look at Sapphire's
data sheet specs and although at first glance it wasn't there, I discovered it (most of the older cards are still one it, they've just changed the coloum width to 0 )
Although there is no Ultimate mentioned the 9600XT is listed as gpu=500mhz mem=580 to 650Mhz DDR1
Closer inspection of the infor on the two cards on sapphire's web site and it looks like the Ultimate version is just a fanless/improved cooler, looking around on google I can find pictures of 3 differnt boards, I'm guessing these
One and
Two are the standard 9600XT And
this is deffinately the Ultimate version (was listed as such on the web page)
Now the numbers showing on the ATi tool could be before the double rate, so 202.5 would be 405 I've seen this before, esp with newer drivers for some reason.
But this is still low for the given clock rates of this card, might be just that it's old and knackered, you could try removeing the HS&F giveing it a good cleaning and reatach it with some new thermal paste.
Also could try increaseing the AGP voltage in the BIOS.
That PSU should be ok for that PC, the only Cooler master 380Watt eXtreme I could find was on Eclipse for £24.62 + what ever there shipping costs are (I really hate it when website don't list there shipping cost anyware
)
If you've not ordered it yet can I sugest
350W FSP ATX-350PNF @ £25.84 from Scan (details
here )
Basically the same but slightly stronger on the +12v rails.
You really could do with some more memory, esp for games, Some cheap no brand pc3200 should be fine, because if you OC your FBS to 200mhz your memory will be running at spec on 200mhz (a 1:1 ratio) Which means it shouldn't die on you.
A cheap 256mb stick is around £10-15 and 512mb is around £15-20
One other thing to do is keep windows very clean with a bare minimum of stuff running in the background, your harddrive defragged and the swap space manually set.