Second PSU for pci-e concection only

[diskmagnet]

My "rig"

AMD 3700+ @ 2.7 and counting
Gig of ram
2x80 gb IDE drives
2x7900GT CO SC
X-FI sound card
DVD burner
and random stuff......


So I cut some of my case installed a another PSU in my case
So now I have:

1.) OCZ 520W ModStream
2.) 450W antec Trupower 2.0

I first was gonna just run everything minus the MOBO connection and video cards off the modstream.
Run the drives fans and other stuff on the Antec.
I am still concerned that the OCZ PSU still wont have enough amps to run the 2x7900gts with my cpu oc'ed.
They recommend 30A+ The OCZ is rated for 28a+ on the 12v i believe


SOOOOOOOOO
My actual question is , is it safe to run one card off each PSU?
Does the 24 pin connection regulate amps watts vots etc? ( cause its not hooked up to anything )

 

[jim1976]

Originally posted by: diskmagnet
My "rig"

AMD 3700+ @ 2.7 and counting
Gig of ram
2x80 gb IDE drives
2x7900GT CO SC
X-FI sound card
DVD burner
and random stuff......


So I cut some of my case installed a another PSU in my case
So now I have:

1.) OCZ 520W ModStream
2.) 450W antec Trupower 2.0

I first was gonna just run everything minus the MOBO connection and video cards off the modstream.
Run the drives fans and other stuff on the Antec.
I am still concerned that the OCZ PSU still wont have enough amps to run the 2x7900gts with my cpu oc'ed.
They recommend 30A+ The OCZ is rated for 28a+ on the 12v i believe


SOOOOOOOOO
My actual question is , is it safe to run one card off each PSU?
Does the 24 pin connection regulate amps watts vots etc? ( cause its not hooked up to anything )

To be sure 100% that you won't have any issues at all you can use the sli on ocz and the o/ced cpu with the other components on the antec..

 

[Praxis1452]

OCZ should definetley be enough by far.

 

[diskmagnet]

Originally posted by: Praxis1452
OCZ should definetley be enough by far.

I think I should be ok @ stock speeds, but I've heard with a overclock either on the cards or on the cpu, they drain alot of the amps. The factory clock is already @ 550/1580 and I can run it @ 590/1800 @ stock volts.
I need to keep my cpu OC at least, or Im bottlenecking myself hardcore

edit

I actaully dont have the second 7900gt yet, hence trying to figure this stuff out before it arrives

 

[Praxis1452]

The sli 7900gt's may draw 12 amps max. Probably 10 amps. That's basically an X1900XTX. an OCZ powerstream can handle that . what's your vcore? jw lets say you draw 13amps which is a pretty big overestimate. Then you got everything else which will draw less than 5 amps. Also nothing will be running at the same time. I mean your hard drives spinning up, dvd burner, both graphics cards loaded, cpu 100% not gonna happen.

 

[CP5670]

The modstream is good enough for those cards. I use it with 7800 GTs, which draw significantly more power.