Bottleneck of Gaming Rig. What is the weakest component?

Finally did it!

It was hard as hell though so here is the full story:

After plugging in only the second GPU just to test it, Crashdows 8.1 completely died upon boot, and didn't want to start again in no mode (safe or unsafe). So 5 minutes after starting the first reinstall was needed.

With all the frustrations about the 2h long reinstalling of Windows, drivers etc. it was time to be struck again. The cards were recognised by both Windows and NVIDIA Control panels, drivers installed but no SLI option. I was astonished to find out that my idiotic (I know I am the idiot not the MOBO) motherboard supported ONLY Crossfire but not SLI !!! 3 hours into this i was almost discouraged but a last effort googling brought me to a techpowerup forum describing a little workaround tool. The HyperSLI software was stated by many to work fine in making some mobos that don't support SLI to actually do it. The only problem was that it was discontinued and supported only very old drivers which was not what i was aiming for.

Reading through the topic took me to another one about a similar tool called "Different SLI" which allegedly not only made SLI possible for non-supported mobo's but even with slightly different GPUs. I wasn't very optimistic but when I tried it, it worked like a charm !!! SLI was recognised and fully installed.

After another win reinstall (due to some driver issues), and a clean installation of all the drivers and the abovementioned tool, now I have made the SLI, and it works perfectly.

P.S. The SLI profiles thing is really an issue due to my gamestyle though. I like to play new games as soon as they come out. And from my short SLI experience, new game profiles are bugged but could easily be worked around (load it with a profile of another game, e.g. FC4 shadows are bugged, but loading it with Batman: AC profile fixes this).


RESULTS: Benchmark utilities show nearly double framerates. As far as games are concerned: Far Cry 4 nearly doubled, AC: Unity is still pretty crappy but now I'm sure it's because of their crap optimizations. Temps are running a bit higher, but still in the norms (With single GTX 660 it was doing 77C tops, now they both go up to 84C with the case closed).

SUMMARY: I've made a running SLI on a non SLI motherboard, with a crappy PSU, and everything works PERFECT. Against all odds the PSU is behaving OK for now (no strange noises/ temperature rises). I will give you an update if it explodes, so you can all say "we told you so!". But for now I'm really proud of this achievement!

P.S: Couple pictures of the hardware:
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