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pcie 1x to 16x? for folding@home? perfomance lost?

post #1 of 7
Thread Starter 
Hey guy i was wondering


if i can add like a gt640 or even a gtx 750 non ti or ti on a pcie x1 and fold on it?

Without performance lost?


I have a p5k-Se with a q6600 just waiting for some gpu come with 3 pcie 1x and 1 x16 smile.gif


Thank you
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post #2 of 7
Folding doesn't require an x16 slot at all since the processing is done almost entirely on the card. You can either buy a riser/adapter to change your PCIx1 to a PCIx16 slot, or you can simply melt the end of the slot open with a soldering iron (the old school, and dangerous method).

There will be almost zero performance loss, but you may have issues with powering a GPU, if it doesn't take external power (both those do, so you'll be totally fine). Even for gaming, the difference between a card in an x16 and an x4 slot is something like 5% performance difference - the slot is faster than the cards need for the most part.
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by CTRLurself View Post

Folding doesn't require an x16 slot at all since the processing is done almost entirely on the card. You can either buy a riser/adapter to change your PCIx1 to a PCIx16 slot, or you can simply melt the end of the slot open with a soldering iron (the old school, and dangerous method).

There will be almost zero performance loss, but you may have issues with powering a GPU, if it doesn't take external power (both those do, so you'll be totally fine). Even for gaming, the difference between a card in an x16 and an x4 slot is something like 5% performance difference - the slot is faster than the cards need for the most part.


750ti some dont have 4-6 pin power plug i think im not sure?

But if their is a power plug it is sure that the gpu will not try to suck power from the pcie riser?


THank you biggrin.gif
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post #4 of 7
It will still pull some power through the riser, but a PCIx1 slot doesn't provide the same total power available as a PCIx16.

PCIx1 slots are 10-25W of power, PCIx16 slots can provide 25-75W of power. If you're running a dedicated GPU, with no dedicated power cable to it, it will run in a lower-power mode so that it can operate off of the 25W of power it is limited to.

If you get an x16 GPU, that doesn't already require it's own power connection, you will have to buy a powered riser instead. A Powered riser is more expensive, and harder to find; they require a connection from the PSU (usually a Molex connection) to provide the extra 50W of power a PCIx16 slot is supposed to be capable over what a PCIx1 slot will do.

tl;dr - if the GPU doesn't have it's own power connection on it, it will run obscenely slower unless you buy a PCI riser that requires a power connection.
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post #5 of 7
Thread Starter 
hum interesting a powered riser can help me with the fact that my psu is dual rail biggrin.gif
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post #6 of 7
Due to the fact that most PSUs don't regulate the Molex power quality as tightly as it regulates the PCI rails, that would be a poor way of looking at this. Using a PCI power cable is always preferable to using those dual-molex to PCI adapters for exactly this reason. Yes, it can and will affect the longevity of the GPU.
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post #7 of 7
Thread Starter 
im talking about a pci riser with a 6pin power plug if they exist

And btw the rail drive the 12V on some plug but they come from the same regulator than the other


Molex or pci power is the same power it just a different wire plug rolleyes.gif
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