It is pretty good, but needs some overclocking. You should give it a chance.
I am also using a a6-3650 clocked to 3.5ghz. With a pair of hd-4870's.
It might not overclock as much on a asus board, i am using a gigabyte board.
Anyways set the memory manually to 1066mhz because it follows the blck clock (fsb). Set the memory manually to ddr3 1600 settings, set the voltage manually for ddr3 1600, set the cpu voltage to 1.45volts.. Google or search tom's for others who overclocked via the blck clock with this asus board. Your apu is multiplier locked at 26x, it is not the "k" version but still should overclock well.
It plays games well at 1080p.. Of course the hd-4870's are helping out.
Ditch that crummy hd-6670.
The hd-6670 should sell well as a used card, it does dual graphics with your A6-3650 and the A8-3870K. It is also a small card that fits in most package system computers.
Ditch that cooler master power supply also.
I dunno used means someone is looking for a deal. I would say maybe $350 used at most..
The used hd-6670 and power supply should fetch about $50 used. (sell them both together, people with a 250 watt oem power supply will like that one)
Take the $50 and buy a new power supply something like this...
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
CORSAIR Builder Series CX600 V2 600W ATX12V v2.3 80 PLUS Certified Active PFC Power Supply $41.99 after $20.00 rebate
Cpu cooler....
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
$34.99 $29.99 after $5.00 rebate COOLER MASTER Hyper 212 EVO RR-212E-20PK-R2 Continuous Direct Contact 120mm Sleeve CPU Cooler Compatible with latest Intel 2011/1366/1155 and AMD FM1/AM3+
second fan for the cpu cooler for push/pull operation..
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
$7.99 COOLER MASTER R4-L2R-20AC-GP 120mm Blue LED Case Fan
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
XFX Double D HD-685X-ZDFC Radeon HD 6850 1GB
$129.99 after $20.00 Free Dirt3 game coupon w/ purchase, limited offer
(Not too bad,overclocks well, but a bit more cash gets you a hd-7850 that is twice as fast)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
$179.99 after $20.00 XFX Core Edition FX-785A-ZNFC Radeon HD 7850 1GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card
Free Deus Ex game coupon w/ purchase, limited offer
(overclocked this matches the 580)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
GIGABYTE GV-R785OC-2GD Radeon HD 7850 2GB 975mhz edition..
$209.99 after $20.00 (beats a 580 at stock oc speeds)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
GIGABYTE GV-R787OC-2GD Radeon HD 7870 GHz Edition 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card
1100mhz 3 fan monster edition.. $239.99 after $20.00
Don't forget to add some case fans..