- Jan 6, 2014
- 2
- 0
- 10,510
Hi I have a Mac pro 1.1 for quite a while now and it came with x2 7800GT in SLI and i bought windows7 for to make the most of this and worked great but recently i bought a evga GTX660 SC
and it ran prefect go 60FPS on games such as skyrim with heavy mods in the back ground and a load of other games worked great to the point i bought extra ram bring it to 12GB and upgraded the CPU to x2 quad core Xean 5355 bringing it from 4 cores up to 8 cores so to finish it off i bought another evga GTX660 SC to SLI but Iv only been able to make it into a dedicated Physx card which is such a waste I feel
so my question is more so to confirm suspicions
My x2 6pins cables for power to the GPUs are from the MOBO or LB not from the power supply like most computers and i now the MOBO or LB can only spare 300W for powering everything on the board. would this lack of power stop the 2 GPUs from running in SLI and if thats so if do directly connection the PSU (which is a 950W PSU) with the second GTX660 would that fix the issue
thanks
and it ran prefect go 60FPS on games such as skyrim with heavy mods in the back ground and a load of other games worked great to the point i bought extra ram bring it to 12GB and upgraded the CPU to x2 quad core Xean 5355 bringing it from 4 cores up to 8 cores so to finish it off i bought another evga GTX660 SC to SLI but Iv only been able to make it into a dedicated Physx card which is such a waste I feel
so my question is more so to confirm suspicions
My x2 6pins cables for power to the GPUs are from the MOBO or LB not from the power supply like most computers and i now the MOBO or LB can only spare 300W for powering everything on the board. would this lack of power stop the 2 GPUs from running in SLI and if thats so if do directly connection the PSU (which is a 950W PSU) with the second GTX660 would that fix the issue
thanks
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