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Best new GPU card for folding in my price range - Page 2

post #11 of 21
Thread Starter 
So it's OK to run a x16 card in a x8 slot? What would be the performance hit?
And, I own the PCs so a physical mod like "opening up" the end of the shorter slot connector does not scare me. Just want to be sure it will work with a x16 card.
post #12 of 21
Since F@H does not require high bandwidth with the rest of the system, you should see zero performance loss using x8. yes it is fine to run it in an x8 slot.
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post #13 of 21
x16 and x8 refer to bandwidth as stated above this is crucial when you are doing a task that interacts with the cpu alot like gaming but when folding most of the work is done on the card especially if you use -advmethods flag and requires little bandwidth so you will be fine just make sure your cooling is proper if using multiple gpu's
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post #14 of 21
Thread Starter 
Great answers. I bought a used 8800 GTS a while back so that will allow me to experiment with these slot options while I wait for the new Nvidia GPU.
post #15 of 21
Actually even for gaming benchmarks only show a 6% performance drop running a card in x4 instead of x16 and it was only like a 3% drop in an x8 slot.

The secret is to just cram as many cards into a computer as possible.

And rather than using a riser/extension card, you can use a soldering iron to melt the end of the slot open so an x16 card will hang in an x8 slot. A lot of server boards don't have ends on their slots for this exact reason. All PCI-e cards are interoperable, it's just a matter of finding a slot to stick them in.

Check it:
449
Slot's #2 and #4 are still x8 slots, but since they have no end on them you can plug in an x16 card to them with no riser required. An x1 slot outputs the same power as an x16 slot since power is on the first couple pins of the slot. The only downside is you void the heck out of any warranty by cutting the slots open.
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Density!
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post #16 of 21
Thread Starter 
Cool! Now I just need to determine how to arrange these 2-slot cards to get more than two in a system redface.gif
post #17 of 21
Thread Starter 
Looks like if I move the new/better GPU (GTX 560 style) to slot 28, I could then populate slots 24, 29 and 30 with some cheap low-profile GPUs like GT240s, GT430s or GT530s. Would/could 3 like this combined, perform as well/better than 1 additional higher end card? My thinking is I can add/populate another cheap card every month or so as funds come about rather than waiting several months to add 1 better card. Remember aslo, I am doing this to (2) workstations worth of slots, not just one. Thanks again.
post #18 of 21
Thread Starter 
Just as a follow up to all the advice:
1) My older workstation with only two PCI-e slots is now populated with 2 x EVGA GTX460 cards, used from EBay at $185 for both: approx. 25K PPD

2) My newer workstation with 4 PCI-e slots now has a new EVGA GTX560Ti DS, a XFX 8800GT used EBay at $35 and a XFX GT240 new from NewEgg, $19 after MIR: approx. 24K PPD

I cut x8 slots open for x16 boards on both MBs and also added a x8 to x16 extender to gain access to a partially blocked slot.
I have one more used XFX 8800GT that I will add to the newer PC but need to wire in an additional 6-pin PCI power connector to power it.
That should push me well above 50K PPD total.

Thanks for the advice!
post #19 of 21
Thats one awesome farm you got going. It you can, pics would be awesome.
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Max's Rig
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WD Black 500GB 7200RPM Noctua NH-D14 Win7 x64 SP1 Asus VE247 LED 
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post #20 of 21
Thread Starter 
My photography skills really suck but thanks for the complement.
My plan is to move most of this to a new rig I have been planning and asking about that will have an i7 CPU, 1200+ Watt PSU and 4+ PCI-e slots to utilize all the cards.
I will gradually replace the older 8800 and GT240 cards with more Ebay deals for 460 or faster cards when I can win them at good prices.
At that point I want to go H2O cooling for all the GPUs as the fan noise right now is pretty loud. smile.gif

If I get to that goal then the pictures will need to come for sure.
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