2011-09-04, 11:34 PM
The 300W power supply will hold you back. The power consumption of the 6750 is 86W. As long as your other components don't take up too much power (please list your components?), you should be fine with a 6750. You also want to be sure that you don't have a slim case. This graphics card will be much larger than the one you have.
The 6750 is an excellent choice for entry level gaming, but you won't be able to turn everything up at 1920 x 1080. However, the 6750 should be about 6 - 8x faster than the 5450.
I also recommend you buy this from Newegg. You can get the same card with a better heatsink for $110 - $20 MIR --> http://www.newegg.com/Product/Product.as...6814150541
The 6750 is an excellent choice for entry level gaming, but you won't be able to turn everything up at 1920 x 1080. However, the 6750 should be about 6 - 8x faster than the 5450.
I also recommend you buy this from Newegg. You can get the same card with a better heatsink for $110 - $20 MIR --> http://www.newegg.com/Product/Product.as...6814150541