Will my psu work with this graphics card?

You need to supply the name of the card. All that tells us is the brand and the memory. But with a stock OEM 300W PSU you are going to be limited to cards that don't need a 6 pin connector for aux power.

You have a power supply whose name none of us probably has ever heard of, so that and that only should tell you that you're probably due for an upgrade. But for a 6670 you wouldn't need more than 400 Watt PSU. Get something from Antec or XFX.

The model number for the PSU says btx, any chance you have a BTX case? If so that card isn't going to fit/work.

What is the +12V rail(s) rating? You didn't list it.

The rails wattage would be nice too. But it look like you are still fine. The card will only draw ~5 1/4 amp at +12V when fully maxed out. Do you have a high wattage CPU also?

My personal advise is never stick with a brand unless it's beneficial to the performance and reliability of your PC and simultaneously it's also beneficial to your pocket. Being a "Corsair person" says absolutely nothing, you could go out and get a CX/VS series power supply which are cheap and have melting capacitors under heavy load and you'd still be making a stupid move. Never generalize your opinion around the products of ONE company, cause they might screw you and you wouldn't even notice. If you don't know what component is best for every occasion ask one of the experts on the site and you might learn something new. That's why they(we) are here.

Melting caps? Can you link any reviews where they melt? I've seen reviews for the CX series and none of them melt. Even under full output.

My unit was destroyed last month after one year of extended use(CX 500) and threw it away. Also check:

http://www.tomshardware.co.uk/forum/id-1804779/power-supply-unit-tier-list.html

Tom's Hardware mentions it's a tier three power supply. I don't think that says it's a quality power supply. Also I remember other members mentioning this in the forum. SR-71 Blackbird to be exact, he can back my claim. The truth is it's a gamble getting a cheap power supply. Its capacitors might be poor and not deliver steady electrical current or might melt. They might not. Are you willing to take the risk though ?

That link is just a list. I was thinking something more like this.

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=324

Even here the caps didn't melt, it was other parts that failed. Here is Jonny's review of the CX430.

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=214

So the CX430 is under $50, but it seems we get a pretty decent unit for the money. We get 430W worth of continuous power with no surprises. Limited ripple and noise, a quiet 120mm fan, active PFC and fully sleeved cables.

Click to expand...

It gave full output, even in the hot box. Scored a 9. I freely admit that it's not the best PSU out there. but I don't understand why people keep saying it's junk when it hasn't failed any tests. People complain about the caps, but I've never seen any review where the caps explode/melt, or ripple is out of spec. It's a low end PSU, not junk. Look at my first link for a junk PSU.

There's no sense moving to the HD 6670 unless your plan is to use it in Dual Graphics Mode. The HD 6670 is about in the same class as the APU's on-die GPU. Maybe even a bit faster.

I know what you mean, though you can only learn from personal experience. It's really a gamble with every piece of electronics you buy. I bought a CiT power supply 400 Watt and was supposed to use it for my build 2 years ago. Last minute I got scared and bought a "decent" 500 watt Corsair CX. Used it for a whole year but it was destroyed a couple of days before I upgraded to my Seasonic M12II 620 Watt. Coincidence? Perhaps but then my "personal" experience tells my I won't risk buying a CX Corsair power supply again. Since I can find a good quality Antec,XFX,Seasonic,Superflower for the same money I don't see any reason why people should invest in something that has not proved reliable for all users. Another similar story is one about the Surface Pro 3. I was very hesitant to buy at first and when I actually decided to do so, I went to a large electronics store in the UK and was informed that somes Surface Pro 3's were recalled because of "heat issues". Any normal user would assume that all Surface Pro 3's suffer from the same issue, however I looked into it and found out that issue persists only on the i7 models and some i5 models but not on the i3 ones. So I went ahead and purchased the i3 model(the one I was originally intending to buy anyway) and have no problems. Many users reported their i5/i7 models throttled down when switching to turbo boost(under load) and fan kicked in, making the back of the device very hot. Microsoft decided to release patches and to cut the long story short, updates took care of the issue on some machines but others still have problems. Where I'm getting at is that electronics are released into the market(at least by large companies like Corsair,Microsoft etc) in batches. Usually the first batches go to testers(Youtube reviewers etc) and some keen users who preorder the item. If you want to play it safe thought you're gonna choose something that comes from the second/third/fourth batch, when most updates are applied and issues are resolved. The same could have happened with the CX power supplies from Corsair. First batches might have had issues and later iterations had them resolved. This could happen with absolutely ANYTHING from a power supply to a laptop or mobile phone or car. Hope I didn't bore you with my essay