What's holding back my system?

Games, Gaming and Hardware
Okay so i recently upgraded my wifes PC ( HP P7 - 1010 ) SAPPHIRE HD 7870 2GB GDDR5 XT WITH BOOST. How ever FPS is still only around 25, granted everything is on max so am guessing pretty much everything is slow apart from the GFX ( if i had my way i'd of junked it and built anew but money and all. Sad Tauren. ) so i am guessing everything is going to be needed to be upgraded but if you could tell me what needs to be retired more it would be appreciated, thank you.

So mobo not the slightest idea
CPU, AMD Athlon II X4 645 3.1 GHz, (quad core)
Ram is, 6 GB 1333 MHz DDR3.
The CPU by a lot. I just made a thread comparing that CPU to older intel dual cores. To get good FPS you're gonna want to upgrade to an FX-4300/6300 if your mobo can support it. If you do that your performance should increase by a lot.

AMD Athlon II X4 645 looks good on paper, but like the bulldozer architecture, there are many flaws in the design making it perform subpar in tasks that emphasize things such as IPC's, low cache latency, good execution between pipelines etc.

EDIT: Sadly the motherboard only supports AM3 not AM3+: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02856262&tmp_task=prodinfoCategory&cc=us&dlc=en&lc=en&product=5098893

You could bandaid this by getting a Phenom II x4 945 (make sure it's 95W TDP not 125W TDP) or a Phenom II x4 B95 (same as the 945 95W TDP not 125W TDP). However, for 200 bucks, you can land yourself an FX-6300+AM3+ 970 board and be better off.
Yeah you'd want to get the latest bios for your pc: http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=4063&lc=en&cc=us&dlc=en&sw_lang=&product=5098893#N503

The best 95w Phenom II was the B99, which was clocked at 3.3ghz. The SKU is: HDXB99WFK4DGM

You can find one on Ebay, but don't buy it unless you can get one for under $90, IMO.

The next best would be the B97, 3.2ghz, SKU: HDXB97WFK4DGM

Or there was one version of the Phenom II 955 that was 95w, OEM non-black edition: HDX955WFK4DGM

Reference this list to confirm the part numbers: http://en.wikipedia.org/wiki/List_of_AMD_Phenom_microprocessors#.22Deneb.22_.28C2.2FC3.2C_45_nm.2C_Quad-core.29

And this benchmark to gauge whether it would be worth it: http://www.anandtech.com/bench/Product/188?vs=102

That's not an exact match on the benchmark. They list a 955 but don't have game benchmarks for it, but if you could find a B99, you could expect maybe between a 15%-20% boost in WoW. The 955 would be close to that, and I'm seeing one on Ebay right now from Hong Kong for $93 shipped. Meh.

Like Chelsi says this would be a band-aide and you'd be better off with a new cpu/board if you wanted to spend the money on it. The new 4350 and 6350 parts from AMD just came out, but you'd do just as well for WoW, if not slightly better, to get an I3 + B75/H77 chipset board.

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