This is the probably the final time I'm going to tell you this, but I think you need to really think about how much money you have and what your priorities are:
You don't have a lot of money but you need a new power supply to keep yourself going: spend as much as you can on that now and then you can reuse that PSU in a new machine in the future. If it were me I'd actually get a solid 650W unit like the Corsair RM650 and forget about multi-GPU setups. They're rubbish anyway, get one good card instead!
After you've bought your new PSU (which you need to do regardless of which option you take below because you cannot afford to buy a new PC to replace your existing one at the moment, so you're going to have to use it for a little longer whatever you decide to do!), you SERIOUSLY need to learn to save money! Have you got a savings account with a bank? If not get one of those as soon as possible. If you haven't got one, do it BEFORE you read the below!
Then you have two options:
- Keep using what you have (with the new PSU) and save hard for a brand new machine: new everything apart from the bits you can reuse (HDDs, PSU and possibly the case unless you want a new style). No spending money on random stuff like car radios or slow and outdated AMD FX-8350s or anything like that: just save for your new PC and then reap the benefits when the day comes.
- Or you look at your current rig once you have your new PSU and decide what is affecting performance. It sounds like it's your graphics card: therefore you save and buy a new graphics card and then keep on saving until you can eventually replace the rest of the machine. If you put an R9 390 or something like that in your current PC you will notice a massive improvement in gaming performance even though your CPU is fairly old, I promise you! Whatever you do, DO NOT buy another 6950 for Crossfire or an older GPU. Forget about them all and get the latest thing you can get.
I can't tell you which to do because only you can decide if your PC is adequate enough for you or not and I don't know how long it will take you to be able to afford a new PC or a new GPU. I have no idea how much money you have other than it's not a lot. If it were me I would probably use your PC in its current configuration (with a new PSU) until I could afford to buy a computer to replace it, but I don't play games and don't require too much from a graphics card. If you game a lot then a better upgrade may be a new graphics card and then you look at the replacing the rest of the PC later.
Does this make sense?
