Don't forget that everything in your computer needs power.
Your Cpu needs about 87W, the GPU needs 75, don't forget your RAM, Drives, DVD and all that stuff.
A PSU also needs some headroom, especially if it is some cheaper brand, making it work on full capacity (which is often lower than advertised), could end up with a destroyed power supply overworking itself, and doing damage to everything.
Your PSU is already working with the bare minimum headroom it can get, Imagine what will happen if you change your 75W graphics card to a 150W one, almost
half of your advertised power capacity.. You could end up with a smoking computer
(or just one that doesn't even start), and you don't want that.
What Brand is your Power Supply by the way?
If you wish to upgrade to a great card, you must get a new, quality power supply (at least 80% 'bronze' efficiency), in the 500-550W range at least.
If you don't want to do that, I can still put my vote to this thing, as it only eats a bit more with these overclocked versions of the card.
visitors can't see pics , please
register or
loginThe normal 750ti only uses 65W, for an example. Amazing for what it is in my opinion.
http://www.videocardbenchmark.net/gpu.php?gpu=GeForce+GTX+750+Tivisitors can't see pics , please
register or
loginThis is what the vanilla one looks like, very deceptive. No 970 but it does the job.
Any brand could work, I have no experience on that sadly.
Unless a newer competitor came out, this is the perfect solution for problems like these
(Need new GPU, but not enough power capacity, still want more performance and DX10-11 features with the same power consumption)