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Whats your GPU score? if you have a 4700mq, then you're probably reaching around 9000-9200 on your GPU score. I think the 240w PSU is a dell slim or something like that, i'll have to look it up again.

*edit* andfor the vbios flash all i'd need is nvflash, the files, a usb stick and knowing the commands?

Can someone please reply with a link for the said PSU dell slim 240w? I am very interested.

Not sure if 8970M (4Gb vRam) would post.

Neither Battlefiled 4 and CoD Ghosts reach 2Gb vRam from a 7970M maxed out at 1080p, so it may not worth it if you don't use higher resolutions

I agree, hd 7970m will enable you to play any game at high to ultra settings @ 1080p, although if you are going for higher resolutions you might need more vram.