I purchased couple of Nvidia GeForce 590 GTXs. I installed both of them on my computer and put with bridge in and started to use my computer. recently I replaced 750watt PSU with Corsair 1200AX power supply and APC 1300 XS. With the previous power supply I was able to get 3-way SLI with the cards and was having great performace while playing video games. by using APC 1300 XS I tried to benchmark the system with 3DMark11. However Ups was intervening because of lots of load on UPS. After changing the power supply but still there was no change in the situation. GPU which is not engaging in SLI is a 1- A of the older video card.
If you know anything about the same then let me know as early as possible.
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