Prime95 performance suffers after installing GT 640

[tServo]

Originally Posted by Rodrigo

Thank you, chalsall. I'll search for a shopping guide to help in the selection of a suitable power supply.

Rodrigo

Be careful about putting new power supplies in HP machines. As I implied
in my first post, I have some experience with these HP desktops,
exept I believe mine were the HP DC7600 mini towers. I found that the screw layout
of where the power supply mates with the case on these machines
was quite different from standard, off-the shelf ones. You might be able
to shoehorn a new one in if you drilled the case but ....
I gave up and I have since donated them to local charities.

I do remember I was able to get one of them to work with a
bizzare power supply that is specifically made for power-hungry
video boards from FSP group called a "Booster X', but it was pricey.
Newegg has them.

[Rodrigo]

Ugh, that would be a problem. I'm certainly not up to drilling holes and performing that kind of major surgery. Is there any way to find out (before taking things apart) whether this particular machine has a standard or peculiar screw layout?

I'll go into HP's website and see if they sell a more powerful PSU for this PC model.

Or maybe I'm better off leaving that machine to do just LL on Prime95, and investigate why the other dx7500 seems to be doing just fine with its own GT 630. That PC made GPU computing look so simple...

Rodrigo

[kracker]

Does your case/psu have something likethis?

Some don't....

[Rodrigo]

Originally Posted by kracker

Does your case/psu have something likethis?

Some don't....

Do you mean the spare (empty) screw holes? No, my case doesn't have them.

Nice graphic, BTW.

Rodrigo

[kracker]

Originally Posted by Rodrigo

Do you mean the spare (empty) screw holes? No, my case doesn't have them.

Nice graphic, BTW.

Rodrigo

No, I mean ones in the circles.

[Rodrigo]

Let's see if we can pin this down.

In the picture, there are two items circled separately in the lower right. The one nearest the corner is a Phillips-head screw; the one to its left is what looks like an empty (unused) screw hole.

Over in the upper right, the two items inside the red oval are a Phillips-head screw (closest to the corner) and an empty screw hole below it.

I'm going on the assumption that you have in mind those empty screw holes, which I'd guess are alternative, pre-drilled screw placements for different PSUs.

Let me know if I guessed right. In any case (so to speak), my dx7500 doesn't have those alternative screw holes.

Or is it the placement of the screw holes (their geometrical arrangement) that I should be looking at?

Rodrigo

P.S. Incidentally, I opened up the case to the "good" dx7500, and it has exactly the same make and model of PSU as the "bad" dx7500. Now I'm wondering if I was unlucky with the bad one, or simply lucky with the good one!

[kracker]

Sorry if I made it more complicated that it seems. I am just trying to make sure your case will fit a new PSU (in that picture, that is the "standard" screw places)

...Well, I guess you could drill... heh
Also, how much space do you think you have? What is the size of your current power supply? (damn some OEM custom cases! :p)

EDIT: Sorry, I know my English could be much better.

[Rodrigo]

Not a problem about the language. We know California's a different country...

I found a photo of the PSU. (Although I should say that the part number doesn't match the part number printed on the PSU that I actually have.) I didn't find a special page for the PSU specs. The dimensions are (approximately) 14.4mm deep x 8.5mm wide x 14mm high.

Rodrigo

[Aramis Wyler]

It was a pain for me to get at that picture due to cookies and the pop-up blocker, so I've extracted the link to the actual picture here. Looks like pretty standard holes to me.

[tServo]

Originally Posted by Rodrigo

Is there any way to find out (before taking things apart) whether this particular machine has a standard or peculiar screw layout?

Rodrigo

I just took a piece of thin cardboard or heavy paper and poked holes in
it when flush against a standard power supply where the screws go
and then put it up against the machine where the power supply screws
are and saw there were at least 2, maybe 3 that didn't match;
and then started cursing.

[kracker]

Originally Posted by Rodrigo

Not a problem about the language. We know California's a different country...

I found a photo of the PSU. (Although I should say that the part number doesn't match the part number printed on the PSU that I actually have.) I didn't find a special page for the PSU specs. The dimensions are (approximately) 14.4mm deep x 8.5mm wide x 14mm high.

Rodrigo

mm? don't you mean cm? Hmm...

EDIT: Also, picture doesn't load/work.