Upgrading graphics card on a built in GPU PC?

So I'm looking to upgrade the graphics card in my PC, but I'm not quite sure how it works on one of these.
 
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=c03499435#N179
 
Above is the unit I have. This PC has the AMD A6-5400K which has the CPU and GPU on the same chip. I'm looking to upgrade the graphics card and I'm not sure if I can just purchase a card and slot it in or if I would need to buy a new CPU to go along with a separate graphics card? Do I have to purchase the better version of the same product (A10 for example) to get the boost I'm looking for? Would the A10 give me a significant boost over the A6 (enough to just settle for that over looking for a graphics card?)
 
Any insight would be appreciated.

You can just get a new graphic card, but the problem is any decent card will need a stronger PSU.  300W isn't going to do much.  

You should be able to add a Radeon HD 6670 and run in Dual Graphics mode. It would be a cheap way to upgrade.

I have to agree with what has been said.  Your PSU is the biggest issue.  I'm not sure about ATI, but it looks like for nVidia the best you can do is a 750ti.  They recommend at minimum 300 and depending on what you get no power cable or a 6 pin power cable for the card.  No matter what you go with I'd check in to disabling the on board video once the card is installed.  I haven't used anything with the video integrated in a long time, so I don't know if that is something you still have to do or no.

You can definitely get the GTX 750ti for medium settings for gaming if that is what you want to do.  The big issue is the PSU like others have said.  If you want a better video card, you should get a 600W or better power supply with at least 40Amps on the 12v rail.  

For dedicated gaming, either look into ATI R9 280X (a rebaged 7970 GHz edition) or Nvidia 770 if you want to play high settings at full 1080p.  If you don't want that high then at least an ATI R9 280 or an Nvidia 760 Ti.

While you are at it, you should put in an SSD drive for your main OS.  Your computer will feel like it's brand new and it will operate a lot faster...no more delay opening things.

Thanks for the information everyone!

s0undwav3 said:

You can definitely get the GTX 750ti for medium settings for gaming if that is what you want to do. The big issue is the PSU like others have said. If you want a better video card, you should get a 600W or better power supply with at least 40Amps on the 12v rail.

For dedicated gaming, either look into ATI R9 280X (a rebaged 7970 GHz edition) or Nvidia 770 if you want to play high settings at full 1080p. If you don't want that high then at least an ATI R9 280 or an Nvidia 760 Ti.

While you are at it, you should put in an SSD drive for your main OS. Your computer will feel like it's brand new and it will operate a lot faster...no more delay opening things.

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soundwave - not an attack but I just quoted yours since most of this fits the consensus - I disagree with one-size fits all thing. Graphic card recommendations are based not only on what you can throw at it, CPU and PS, but also what games you are playing. If all he plans on playing is Diablo, WoW, or Starcraft, then he is far better off saving the money and getting the 750ti. I would argue that for even pushing 1080p in most games. Sure you might have to tone it down a bit, but it is not like the A6 is the beast of CPU performance.

I do not even see in here a mention of the games...what if they are optimized better for AMD? nVidia? That may sway some people as some games are optimized for better performance on one platform versus the other - regardless of what the two sides tell you.

As for the SSD, most people will not notice it for most games and I'd rather see people get a better GPU and CPU first. A lot of people are concerned over game performance and not necessarily boot up speed. That said, the prices are coming down and are almost in my range now - but I said I wouldn't get anything < 500gb. One thing to note on SSDs, usually great for reading but horrible for writing. If you have "chatty" apps that write to disk, then a SSD may actually slow you down.

disagree on both fronts, people tend to build pc's and then want to futureproof but then they buy on tight budgets and then of course, spend more on the long run by upgrading shortly on graphics and hard drives.  seen this over and over and over with people I used to build PC's for.  of course the builder makes more $$$ but then what about stability and things of that sort.

been on a high quality ssd for over 2 years now and there are all kinds of data and benchmarks that show that you buy better quality ssd then write performance isn't horrible for writing at all...but if you cheap out on a cheap ssd yea you will run into all kinds of issues.  that was the case of ocz drives and some of the sandisk drives.  

i upgraded my sister's really old athlon II CPU with a really cheap off the shelf video card (not using integrated graphics) and slapped in a high quality crucial ssd drive and the thing flies both in performance and stability.  no complains ever about write performance at all...and that's a really old cpu but she can run everything she had been much faster and newer web based games and stuff that she could not do on a standard hdd on that older cpu.