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You can get a 2nd 7950 for ~100 quid, though you can also crossfire with 280 or 280x. I'd do that instead, performance is similar or better than a 290x/970. It's not gonna work on your 600w PSU but with your budget you can easily upgrade PSU and keep it for 5 more years or so.
Thanks for the idea but i never did like the idea of crossfire , as so many peps seem to have problems with freezing or bsod's when using dual cards.
i have been looking more and might get
https://www.overclockers.co.uk/showproduct.php?prodid=GX-351-SP
is that just the same card as
https://www.overclockers.co.uk/showproduct.php?prodid=GX-363-AS&groupid=701&catid=56&subcat=1752
but with 3 coolers and overclocked slightly ?
will it use even more power to push my psu beyond its limit..
btw what will happen if my psu cannot deliver enough power ?
The short answer is that the Sapphire is a much better choice.
The long answer is: The Sapphire is the much better choice this generation, and here's why. Sapphire only do AMD cards, because of this they made new coolers for the Hawaii chip, Asus and MSI both recycled coolers that were designed for Nvidia card chips. Pics of the contact plate for the 290x Matrix show that out of the five pipes that made contact with the Nvidia chip the cooler was originally made for only 3 make contact with the smaller Hawaii chip and the outside two do not connect fully.. This effects performance and can be seen in how unreliable temperature levels have been, Where as the Sapphire appear to be pretty reliable in that respect.
Display connectivity options include two DVI ports, one HDMI port, and one DisplayPort. You may use all outputs at the same time, so triple-monitor surround gaming is possible with one card.
Please note that the DVI outputs no longer support analog monitors. AMD also improved their display controller hardware, so you can now use three HDMI/DVI monitors at the same time without having to buy an active DP-to-DVI adapter (this was a requirement to providing the TMDS clock signal for the third monitor on previous generation cards).
The GPU also includes an HDMI sound device. It is HDMI 1.4a compatible, which includes HD audio and Blu-ray 3D movies support.
See above, you dont need an adapter.