I meet the minimum requirements to play a certain game on my computer but I want to see if I can meet the recommendations by upgrading. One of this issues is my CPU speed and I have found a compatible CPU but uses 125w. Would this with my graphics card, 300w, on a 400w power supply not work? Should I also be considering any other parts of my computer that take up watts in this equation? I don't want to replace the power supply because it could mean replacing a lot of other parts along with it.
Solution
holyprof
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- Dec 16, 2011
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Please give the exaxt models of the CPU, graphics card and power supply.
How do you know the GPU draws 300W? Being designed to withstand 300W doesn't mean it will actually draw that much power. Better check some online review of the card to see what's the real power draw when gaming.
About the CPU, there are no games that will max out a modern multicore CPU to its TDP as well. IT can only be acheved using special software like OCCT, Prime etc.
In case you don't want to tell what are the CPU, GPU and power supply, here's a simple way to check power requirements. Modern PCs draw most of their power from the 12V output(s), also known as rail(s). On the PSU sticker you can find the rated output (in Amperes) of the 12V rail (or rails).
Let's say your PSU only has one 12V output rated at 25A (typical medium-low quality 400W SPU).
125W CPU means 125W / 12V = 10.4A
300W graphics card means 300 / 12V = 25A
so the total draw will be 35.4 A at full synthetic load (will never happen in real life but the PSU should be ready to supply that power even if for a short time).
For your PC, you will want a PSU with at least 38A on the 12V rail, preferrably 40 or more like one of the following:
38A
http://pcpartpicker.com/part/corsair-power-supply-cx500
46A
http://pcpartpicker.com/part/corsair-power-supply-cx600m
49A
http://pcpartpicker.com/part/evga-power-supply-100b10600kr
How do you know the GPU draws 300W? Being designed to withstand 300W doesn't mean it will actually draw that much power. Better check some online review of the card to see what's the real power draw when gaming.
About the CPU, there are no games that will max out a modern multicore CPU to its TDP as well. IT can only be acheved using special software like OCCT, Prime etc.
In case you don't want to tell what are the CPU, GPU and power supply, here's a simple way to check power requirements. Modern PCs draw most of their power from the 12V output(s), also known as rail(s). On the PSU sticker you can find the rated output (in Amperes) of the 12V rail (or rails).
Let's say your PSU only has one 12V output rated at 25A (typical medium-low quality 400W SPU).
125W CPU means 125W / 12V = 10.4A
300W graphics card means 300 / 12V = 25A
so the total draw will be 35.4 A at full synthetic load (will never happen in real life but the PSU should be ready to supply that power even if for a short time).
For your PC, you will want a PSU with at least 38A on the 12V rail, preferrably 40 or more like one of the following:
38A
http://pcpartpicker.com/part/corsair-power-supply-cx500
46A
http://pcpartpicker.com/part/corsair-power-supply-cx600m
49A
http://pcpartpicker.com/part/evga-power-supply-100b10600kr
holyprof
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- Dec 16, 2011
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Oh yes, much easier now.
First of all, the GTX 750 draws 76W at full synthetic load and around 60W when gaming:
http://www.techpowerup.com/reviews/ASUS/GTX_750_OC/23.html
That will result in 76W / 12V = 6.3A
For the CPU, we can keep the 125W / 12A = 10.4A
The PSU seems to be as i guessed, cheap 400W supply so the 12V rail should be good for 20-25A which is enough to power your system.
If the PSU is this one http://www.amazon.com/Apex-ALLIED-Power-Supply-AL-A400ATX/dp/B00008ZPNA
it has two 12V rails, with 13 and 14A rated output so the total is 27A, not far off my 25A guess.
Conclusion: it will work, but i strongly advise you to replace the power supply as soon as you can with one of those i recommended or similar.
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