It all depends on the power supply you have. There were two, a 240W and a 330W. With the 240 you would have to upgrade the PSU for almost any GPU upgrade. With the 330W you could not use the 970 which requires a 500W PSU but you could go to a GTX 1050Ti. The 960 and a GTX 1060 both require a 400W PSU and might work. Looking at the specs for the card you have now (660) Nvidia calls for a minimum of 450W with a 6 pin power plug. If your 660 runs now then the 960 or 1060 should work.
I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop
JOcean
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Posted December 15th, 2018 06:00
It all depends on the power supply you have. There were two, a 240W and a 330W. With the 240 you would have to upgrade the PSU for almost any GPU upgrade. With the 330W you could not use the 970 which requires a 500W PSU but you could go to a GTX 1050Ti. The 960 and a GTX 1060 both require a 400W PSU and might work. Looking at the specs for the card you have now (660) Nvidia calls for a minimum of 450W with a 6 pin power plug. If your 660 runs now then the 960 or 1060 should work.
I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop