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650 watts not enough?

post #1 of 8
Thread Starter 
Well, just moved my 7800GTX to a 650 watt PSU because of power problems...Then the Sentinel reduces the clock rate because of insufficient power. I've got dual 20A rails (at least 20A), but I cannot clock more than 480Mhz/1300 now. Any ideas?
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post #2 of 8
you don't need to oc, unless you are trying to set personal records. god.
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post #3 of 8
The Watts and amps are definitely plentiful, but how are the rails themselves? Are they close to spec (+/- 3% or so) and stable?
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post #4 of 8
Quote:
Originally Posted by thecomputerdude
Well, just moved my 7800GTX to a 650 watt PSU because of power problems...Then the Sentinel reduces the clock rate because of insufficient power. I've got dual 20A rails (at least 20A), but I cannot clock more than 480Mhz/1300 now. Any ideas?
Keep in mind that there is no regulatory body specifying standards to power supply manufacturers. Ever been to a swap meet and seen a car stereo equalizer that claims it's 300 watts per channel, but it's lighter than a silver dollar? What brand is your power supply and is that 650 watt rating peak power across all voltage rails? Also, is that rating at some rediculous temperature of like 5 Celsius?
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post #5 of 8
Thread Starter 
Thanks for the comments. I'll look into it.

It doesn't seem to have a cooling issue, it runs pretty cool.

As far as OC'ing, I actually am trying to set personal records ( wish I had an AMD rather than an Intel).

As far as the rails, how do I measure whether or not they're to spec?

And yes, it's 650 watts max across all rails. Under full load- graphics and CPU-the PSU is pulling 410-430 watts from the wall.
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post #6 of 8
What brand/model is the power supply? If its a 650W its likely an enermax, thermaltake, or one of several others. Post and let us know.
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post #7 of 8
Thread Starter 
You're probably not familiar with this one- it's a Dell power pack. One of the long ones that mounts under the computer in it's own case with 2 cooling fans. I've got plenty of juice for the processor, just the GPU doesn't seem to have enough juice.

Edit- Talk about a thread killer.
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post #8 of 8
Thread Starter 
Why does the word "dell" always kill the topic?

Next time I'll say it's an Enermax.

EDit- Problem solved. My SLi 12v rail was dropping out. I got the other Sli rail and the card gets juice. So much for adding SLi right now.
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