: I am placing this paragraph at the top. One other note, your system has Intel 4500 onboard graphics which is pretty decent and BETTER than the discrete HD5450/GT 210 for instance and barely below the HD6450. So if you want to step up be sure to evaluate how much of a performance bump above the i4500 you are getting for whatever GPU you decide upon or you will obviously be disappointed in the money spent.
Actually the mfg. recommendation is BS. The GPU's maximum power utilization is known
. Overclocking will increase that requirement until it either fails or hits a current wall (75W in this case; see below).
GPUs pull exclusively from the +12V rail of the PSU, so that voltage (listed on the side of the PSU) is all that is important. It can be readily converted into Amps by dividing Watts by 12. Note: The quality of the PSU determines the actual output as opposed to the claimed output. As temperatures rise inside the case efficiency can fall and poorly made PSUs claim outputs based upon room temps as opposed to more realistic 40C. Keep in mind the +12V line is shared with other PC components so the GPU cannot take it all. Using a third of the honest output is safe. Half is likely survivable but makes me suck wind.
The PCIe x16 slot delivers a max. 75 W (6.25A) by spec of +12V.
I try to keep up with the low power GPUs suitable for low profile (LP) cards
and nVidia's latest 700 series are amazing
(but few LP cards exist). But depending upon your budget some of the older nVidia/AMD cards not shown here may do well (compare benchmark hopefully using some benchmark app similar to what you use your PC for before buying). [notes below are for me, not my recommendations to you]
GPU Benchmark Watts Amps Max OC
GT 640* 1,287 65W 5.4A 1,203
R7 250 1,386 65W 5.4A 1,212
GT 740 1,440 64W 5.3A 1,164
HD 7750 1,634 55W 4.6A 1,227
GTX 650 1,841 64W 5.3A 1,240
GTX 750 3,266 55W 4.6A 1,480
GTX 750 Ti 3,641 60W 5.0A 1,356Passmark Benchmark Score
Maximum Power Demand in Watts (on +12V rail)
Maximum Power Demand in Amps (on +12V rail)
--all power provided by the PCIe x16 slot which can deliver +12V up to 6.25A (75W) on demand.
* GT640 DDR5 max power is 49W (4.1A) at higher clock speed. In theory
could max. OC to 1,601MHz.
Max. OC (overclock) based upon 75W in MHz (projected)
Low profile cards. Low power using modern cards with maximum performance. Galaxy makes a GTX 750 Ti LP (2Gb DDR5)...$180Zotac gtx650
[single wide, 10.23" long; both LP brackets included, must swap]http://www.amazon.com/Zotac-GeForce-Exp ... -61008-10M