need new graphics card

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not really sure of the best one I could/should get

I have:

OCZ ZT 650W PSU modular
amd athlon 64 processor 3800+ 2.4mhz
generic motherboard that came with the PC - has one PCI-E slot
currently have a GT520 gfx

I'd like to play dota2/csgo on high - right now I get around 30 fps on both of those games on low

do I need to upgrade my processor also?

 

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I just really want to spend just enough to run dota 2 and CSGO: This system is used for general browsing and for css and dota - but now the new games are out I can't really play them very well so need an upgrade so I can play them smoothly. I have no intention of playing any of the newer games at all (e.g. bf2 etc).

What CPU do you recommend getting?

My motherboard is a ACER E380 T180 MOTHERBOARD MB.S5609.001 MBS5609001

edit: I have a 1360x768 res monitor - I play all my games on 1024x768 or 860x640 resolution.

 

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Also, bare in mind I have a mATX case, and a mATX motherboard so the graphics card has to be fairly small. If measurements are needed then please let me know.

 

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What version of Windows are you using?

I would probably grab a 5770/6770/7770 (whatever is cheaper) and then maybe buy a new Pentium + mATX board if you really want to stay cheap. Depending on your OS though you may need to do a clean install of Windows if you do get a new CPU and motherboard.

Windows 7 32bit

why do I need a new motherboard? Wouldn't a dual core processor be sufficient for my needs?

 

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I'm guessing it's a prebuilt Acer PC then? Do you know the PC model? I'm pretty sure it will support all the Athlon X2 processors upto 89W (you may need to update the bios), but i'm not sure about the Athlon II or Phenom I/II chips.

I'd personally go with the Radeon 5770/6770/7770 (all pretty much the same) or a Geforce GTX 550 Ti... All should be small enough to fit in a Micro ATX case and can be picked up pretty cheap.

Hm - how do I update the BIOS?

The model of the computer is a Acer Aspire T180-OA72

If only upto 89W then any recommendations on the best CPU I could get? As for the GFX I read online that the GTX 550Ti is pretty good so I think I'll go for that.