The 330W is from my experience far better than run of the mill 400 Watt PSUs. When we replace a PSU I replace it with one that I tap 50% of max and keep it a single rail model.
330W is definitely less than you see called for on this GPU and no one should tell you it's OK. That doesn't mean it won't work.
Hey guys ,
I got a x51 recently, which comes with the ATI R9 370 ( the 4gig OEM model), but am looking to replace it with a better card. Really the one I want to switch it with is a GTX 970, but it's a much more powerful GPU and I am still a bit worried about doing it since the power supply is 330 W. (and also the length of the card has to be max 9.5" , but I think some 970 models allow that.)
As far as I've read on forums some people have done it successfully.
So my question is have any of you guys had experience with this, or if you can verify if it's possible? Will provide full specs if needed.