I have a suitable power supply and I can fit the card in my case and I even have the right PCI E slot and I also upgraded it a long time ago with a 7750. Should the 7950 work with this motherboard? BTW not sure what the motherboard brand is but it came from an acer m3450.
http://www.microcenter.com/product/403013/R7950_TF_3GD5-OC_AMD_Radeon_HD_7950_Twin_Frozr_III_Overclocked_3072MB_GDDR5_PCIe_30_x16_Video_Card
http://www.microcenter.com/product/403013/R7950_TF_3GD5-OC_AMD_Radeon_HD_7950_Twin_Frozr_III_Overclocked_3072MB_GDDR5_PCIe_30_x16_Video_Card