Overclock.net banner

One Card, Two pci-ex slots

949 views 22 replies 6 participants last post by  jph1589 
#1 ·
What would happen if you could theoretically plug a single video card into both pci-ex slots (thats if you have an sli chipset/mobo)? think about it...
 
See less See more
1
#3 ·
Quote:

Originally Posted by mootin View Post
yeh cuz thats gonna work and do a whole lot of good.

it would fry the graphics card as the pcie slots supply power to the card aswell.
could you be a little more negative? and tell me something I dont know
 
#6 ·
Quote:

Originally Posted by P_Doughboy View Post
could you be a little more negative? and tell me something I dont know

oh, and...power isnt pushed through the pci-ex slots, it is pulled by the video card (however much it calls for; and most peoples w/vmods would be calling for alot)...

I want some good input plz...
 
#8 ·
Quote:

Originally Posted by trueg50 View Post
There is absolutely no need for the second PCI-E to connect to, simple as that.

Any extra power is drawn from the PSU via a PCI-E 6 (or 8) pin power connector.

Even AGP 8x hasn't been fully tapped out in terms of bandwith, and we are still moving to PCI-E 2.0 with double the bandwith.
some cards dont have a 6 (or 8) pin power connector...im not thinking in terms of bandwidth necessarily, but in terms of dual channel bandwidth if im lucky
 
#9 ·
Quote:

Originally Posted by P_Doughboy View Post
could you be a little more negative?
Time would reverse as the oceans boiled into the sky. Montana would suddenly implode releasing demons that scratch the paint off brand new cars. Bush would be re-elected and Rosanne and Rosie O'Donell would help him rule as the three took over the world. Our new anthem would include the word Patootie.

Seven Days of acid rain would come down and destroy most of the animals and wildlife in both hemispheres, computers would become outlawed shortly after the internet is closed down but hackers try to setup a temporary one over telephone lines using Excalibur BBS.

Your eyes would slowly melt from your head as the gamma radiation from a passing astrological event and handguns would be passed out to children who've decided, hell no they won't drink their ovaltine and anyone over 14 must die.

 
#12 ·
No need, I reiterate that the GPU would be the bottleneck not the adapter or connection.

The PCI-E slot provides 75 watts of power and upto 16 lanes of bandwith, some cards draw more than 75 watts and need more from the PSU via a connector.

Bandwidth provided by the PCI-E slot is so high that no modern card, no card ever created for that matter can be hindered by the 16 lanes provided.

The x1950XTX in its AGP form was compared to its PCI-E counterpart and performed exactly the same, thus even that high powered card was not hindered by 2 gb/second AGP connection, PCI-E is 8 gb/second.
 
#13 ·
Quote:

Originally Posted by trueg50 View Post
No need, I reiterate that the GPU would be the bottleneck not the adapter or connection.

The PCI-E slot provides 75 watts of power and upto 16 lanes of bandwith, some cards draw more than 75 watts and need more from the PSU via a connector.

Bandwidth provided by the PCI-E slot is so high that no modern card, no card ever created for that matter can be hindered by the 16 lanes provided.

The x1950XTX in its AGP form was compared to its PCI-E counterpart and performed exactly the same, thus even that high powered card was not hindered by 2 gb/second AGP connection, PCI-E is 8 gb/second.
excellent points...well taken...but really it all comes down to one thing: i cant get enough power to my 8600gt from my vmod and there are no external connectors
 
#17 ·
Quote:


Originally Posted by trueg50
View Post

So have you already volt modded it?

If not then how do you know it will draw more than 75 watts? Plenty of people have volt modded 7600GT's and they don't need a supplemental power connector; given that the 8600GT is close in power to the 7600GT does it really draw that much more power?

maybe they dont have the same mobo as I do...ECS C-19A Sli
 
#18 ·
It is an industry standard that the PCI-E alot provides 75 watts of power, if a card needs more the PCU gives it to it via a PCI-E 6 or 8 pin connector.

No motherboard is unique in the voltage it gives everyone gives the same (give or take a fraction of a watt) no ifs ands or ECS motherboards. Heck your motherboard supports SLI so it has 2 PCI-E 16x slots providing those 75 watts.

http://www.guru3d.com/article/Videocards/326/7/

"The design is clean and simple. A single slot fan will cool down the card. It's audible, yet not at all too noisy. Since the card will consume roughly 68 Watts when it's peaking it can draw its power from the PCI-Express slot, which maxes out at 75 Watts. So there really is no need for an external PSU connection."

so it draws less than an additional 7 watts when they are volt modded.

while the 8600GT:
http://www.guru3d.com/article/Videocards/427/4/

"A clean, pretty looking design. The 8600 GT cards have quite a low power draw due to the lower clocks, roughly 45 Watts. So here we do not see a 6-pin power connector. Which quite honestly I would have liked to see... why ? Because it's good for overclocking."

look at that, a 7600GT draws 69% more watts than an 8600GT, and the 7600GT has been well known to overvolt quite well. They say the extra cable is uesful for overclocking, but if the 7600GT can be heavily volt modded so can the 8600GT. Many members of this forum have heavily volt modded 8600GT's to prove it.

I still don't get why a second PCI-E (not PCI-ex, which can be confused with the wholy incompatable PCI-X) would be desired for more voltage" it would be much easier to rig up a PCI-E power cable than to arrange another PCI-E device to plug into the 8600GT.
 
#19 ·
Quote:


Originally Posted by trueg50
View Post

It is an industry standard that the PCI-E alot provides 75 watts of power, if a card needs more the PCU gives it to it via a PCI-E 6 or 8 pin connector.

No motherboard is unique in the voltage it gives everyone gives the same (give or take a fraction of a watt) no ifs ands or ECS motherboards. Heck your motherboard supports SLI so it has 2 PCI-E 16x slots providing those 75 watts.

http://www.guru3d.com/article/Videocards/326/7/

"The design is clean and simple. A single slot fan will cool down the card. It's audible, yet not at all too noisy. Since the card will consume roughly 68 Watts when it's peaking it can draw its power from the PCI-Express slot, which maxes out at 75 Watts. So there really is no need for an external PSU connection."

so it draws less than an additional 7 watts when they are volt modded.

while the 8600GT:
http://www.guru3d.com/article/Videocards/427/4/

"A clean, pretty looking design. The 8600 GT cards have quite a low power draw due to the lower clocks, roughly 45 Watts. So here we do not see a 6-pin power connector. Which quite honestly I would have liked to see... why ? Because it's good for overclocking."

look at that, a 7600GT draws 69% more watts than an 8600GT, and the 7600GT has been well known to overvolt quite well. They say the extra cable is uesful for overclocking, but if the 7600GT can be heavily volt modded so can the 8600GT. Many members of this forum have heavily volt modded 8600GT's to prove it.

I still don't get why a second PCI-E (not PCI-ex, which can be confused with the wholy incompatable PCI-X) would be desired for more voltage" it would be much easier to rig up a PCI-E power cable than to arrange another PCI-E device to plug into the 8600GT.

point taken...thank you for your help, and this stuff is news to me
 
#21 ·
Seeing as how the ECS C19-A SLI only runs its PCIE X16 slots at X8, I think you'd be much further ahead to get the one slot up to x16 instead. Does that have something to do with why you want to do this? I didn't notice that you mentioned it. Maybe I didn't read well enough though.

Edit.......that X8 speed is also when you only have one GPU installed. It is not an sli limitation it is an all the time limitation.
 
#22 ·
Quote:

Originally Posted by jph1589 View Post
Seeing as how the ECS C19-A SLI only runs its PCIE X16 slots at X8, I think you'd be much further ahead to get the one slot up to x16 instead. Does that have something to do with why you want to do this? I didn't notice that you mentioned it. Maybe I didn't read well enough though.

Edit.......that X8 speed is also when you only have one GPU installed. It is not an sli limitation it is an all the time limitation.
I think the problem he is having is that he needs more power for his volt mod. He appears to have reached the limit of the mod and wanted to go higher, he wanted to draw power from the other PCI-E slot.
 
#23 ·
Quote:


Originally Posted by trueg50
View Post

I think the problem he is having is that he needs more power for his volt mod. He appears to have reached the limit of the mod and wanted to go higher, he wanted to draw power from the other PCI-E slot.

Yes but......... what good is the voltmod for that card on a motherboard that only runs the PCIE slot at X8 even when you only have one gpu installed? I was hoping to get him to ask himself that question with my earlier post.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top