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What graphics card is recommended to replace an HD-4870 in a 775 system?

i also have an q9550, to oc it you need a good cpu cooler, im using a phantek dual rad air cpu cooler and it a monster at cooling but you need a big case for it. if you what excellent cooling but don't have case for big dual rad air coolers or full watercooling setup. then i suggest something like a h60, h80 or h100 closed loop watercooling units. one of them will let you oc you cpu to 3.8-4.0ghz. as for graphic card the rev2 of the msi 7950 tfIII is an excellent buy and will do you well. i've recently bought the HIS IceQ 7950 BOOST when it was on sale for £224 few days ago and runs tomb raider on high @1920x1080 on a 42" screen fine. the only problem you mght fine is that your psu won't let you have a stable oc and run the 7950 as i suppect you might have rippying happen even with the 600w psu.
The problem is the cost of those high-end all-in-one water coolers..air cooler could often achieve the same cooling capability at 1/2 or 2/3 of the cost.

Also for the kind of games that OP is playing (World of Tanks and PS2), plus on a 120Hz monitor, he would be better off trying to find a cheap 7850 2GB and spend the money saved plus the money on selling his current CPU bundles toward upgrade to a i5. Those games are extremely CPU dependent, and to be frank...even on a overclocked Q9550, the 7950 would most probably not offer better frame rate than a 7850...
 
The problem is the cost of those high-end all-in-one water coolers..air cooler could often achieve the same cooling capability at 1/2 or 2/3 of the cost.

Also for the kind of games that OP is playing (World of Tanks and PS2), plus on a 120Hz monitor, he would be better off trying to find a cheap 7850 2GB and spend the money saved plus the money on selling his current CPU bundles toward upgrade to a i5. Those games are extremely CPU dependent, and to be frank...even on a overclocked Q9550, the 7950 would most probably not offer better frame rate than a 7850...

Not sure of an i5 at this moment, not with Haswell round the corner. Though if I get bored waiting I may well stick with a Maximus V Gene and 3570K option. I originally had such planned.

Any new build will be going into my current case and possibly retain some items such as PSU, cooling, GPU, storage.

I am not sure what air coolers are recommended, but something like the NH-D14 is rather huge, noisy, and limits space and actually could inhibit cooling and a build inside the TJ08B-E in my opinion. It would certainly not allow me to use the HDD cage and software raid a couple of HDD's.

So any examples that would be better than for example, an H80i with a 775 back plate?

I have only spent around £60 more going for the 7950 instead of a 7850. I doubt I would get much for the 775 kit on the members market, but may well consider that in future. I had intended to later pass this PC's old components to my son or maybe even put it back together as a media PC, (the Q9550 replaced an E8500 which was passively cooled).

Not really noticed the Q9550 holding me back so far, and many online benchmarks seemed to indicate it was not that bad for gaming when i5 was released. I get that current games may see bottlenecks, but at the moment, with an HD-5770 passive cooled GPU and a Q9550 running stock, I get 100+ frames on WoT with selective low settings.

At the moment, as I am unsure what direction my next CPU and motherboard will take, I see no harm in adding components such as an SSD, GPU, CPU cooler and maybe even a 4tb storage drive that could be transferred to a Haswell later in the year.

They will still improve this PC's performance, even if bottlenecked.
 
Not sure of an i5 at this moment, not with Haswell round the corner.
Sorry if I wasn't clear, but when I said "i5", I meant including Haswell as well, depending on how soon you planning on upgrading.

To be honest, I'm not sure if it is a good idea to go all out and get a 7950 now, even if the next gen card was to be release toward the end of the year. IMO, with you current CPU, you'd be better off getting a 2nd hand 5850 or something to get by for now, then in the future upgrade to both Haswell and may be a 8850, and sell the 5850 at a loss of may be £15-£20 (or you could think of it as "renting" it to use for 6 months).
 
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