Physics question....

[Nica Guy]

Hi I just have a couple of questions...

I´m planning to buy another gtx 280 for my rig as I already own one of them and for $240 they are still an awesome deal...

The thing is my Motherboard has 3 pci express slots. They are running at 16x 16x 4x, so both my 280´s would use the x16

slots in SLI, that leaves me with one x4 pci express slot unused. I´m planning to use it for physics.

Would the x4 slot bottleneck the physics card? The physics card is a 8800gts 512mb (g92).

Thanks in advance guys...

 

[meodowla]

I think...BFG PhysX card works on PCI slot...

 

[Nica Guy]

meaning?
also could u give a link to that physics card?

i have a x4 pci E slot would it bottleneck the 8800gts?

 

[orangegator]

No, if only used for physx, it wouldn't bottleneck it. I've tested a 9600gso in a pcie 1x slot using it for just physx and it didn't seem to bottleneck it.

 

[meodowla]

http://www.bfgtech.com/bfgrphysx128p.aspx

 

[Nica Guy]

awesome that was the answer i was looking for thanks
but, a 9600gso is considerably weeker than a 8800gts and so, it is harder to bottleneck, but the interface slot used is bigger with my 8800gts (PCIE x4)...

so whats the conclusion after knowing that...
bottlenecks or no?

 

[meodowla]

It won't bottleneck..

 

[Nica Guy]

ok cool thanks

 

[Nica Guy]

hey how dumb of me i forgot one very important aspect...

i dont know if my power supply would boot all that hardware...

My power supply is a PC P&C 750W silencer with 60A on the 12v rail...

I would be running the 2 gtx 280´s, the 8800gts for physics and an i7 920...

I know my power supply is pretty strong and capable but this is a lot...

What do u guys think?

 

[Nica Guy]

?? no one?

 

[orangegator]

http://www.extreme.outervision.com/psucalculatorlite.jsp

 

[Nica Guy]

thats bugged it tells me i need a 1000w PSU with my setup which im running perfectly with my silencer and I know it´s not close to max potential....

 

[meodowla]

With 3 of the best GPU's.... can expect something near to that.. he..he..

 

[Nica Guy]

i think ill just stay with the sli 280´s which i think are enough to render and do the physics...