Will a 780 work with my build?

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sageofstuff

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https://uk.pcpartpicker.com/list/LXpVf8

I finished this build to find that the graphics card I got (960) did not work and have now returned it. I can now get a 780 at the price i got my 960 for yet my power supply is lacking the extra 6 pin adapter so I was wondering if it was worth using a molex converter which would hopefully work. Any comments would help but I think everything should work fine.
 
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The 780 is recommended to run with a minimum of 42A on the 12v rail. That's a low quality PSU only rated at 32A, if it works Id be seriously concerned it would fail under load which can cause damage to your system
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Eximo

Eximo

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Generally when your power supply doesn't have the required number of PCIe connectors you shouldn't use it.

However, you have a fairly low power system, and could probably get away with it.

GPU is rated at 250W, PSU has 384W on the 12V rail.
 
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sageofstuff

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But could that be because 4 years ago when they released it there were no desktop processors running at 50w like mine?
 
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sageofstuff

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On the 12v rail? Could you please explain
 
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sageofstuff

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Ok, i had no idea that was something I needed to look out for. Thanks for the help.
 
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Eximo

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Generally you ignore 5V and 3.3 load on modern computers as these are very minor. Both the CPU and GPU VRMs convert 12V down to the low voltages that integrated circuits need. The CX430 has a single 12V rail, larger power supplies can have multiple. This is a safety mechanism to insure that too much current isn't drawn through a particular set of cables. Though there are many power supplies with a single large 12V rail.

CX430 is indeed a low-quality supply, I wouldn't run for very long with the 780 and that power supply, but seek to replace it soon. Or seek out a lower-power GTX1050ti which should be roughly as fast.
 
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engineer5261

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Your CPU + GPU can possibly consume (worst case) 250+51= 301Watts alone. While Eximo is correct in saying that you can probably get away with it, I have the opinion that you should not.

Under peak loads you may be operating close to the PSU limit, which I do not recommend. Furthermore you will have literally zero headroom in case you want to upgrade with to a more powerful CPU (any i5/i7) or GPU(might be worth looking into the new GPU's, they consume less power but for that much money you could get a better PSU).
 
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sageofstuff

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Oh ok, never knew that. A 1050ti is slightly better than a 960, not on par with a 780 surely?
 
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engineer5261

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780 is significantly stronger than 960/1050ti. 1050ti would be a good choice for your current PSU.
 
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Eximo

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Correct.

A closer match would be the GTX1060 3GB, but it is a little faster.

Since it is hard to get cards that are far apart on the same chart I often have to guesstimate.

GTX1060 6GB = 90-95% of a GTX980 in DX11 titles = 10 SM units
GTX1060 3GB = 85%
GTX1050Ti = 6 SM units = ~55 FPS
GTX980 = ~90FPS in BF4 at 1920x1080
GTX780 = ~67FPS in BF4 at 1920x1080
GTX960 = 1/2 of a GTX980

I was hoping I could find a pair of GTA 5 charts, but no such luck. GTX1050ti claims 70 FPS on DX12 BF1, so it may have the upper hand with newer games over the 780 in any case.
 
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engineer5261

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A good breakdown there. 1060GTX would be ideal but sadly it is a little bit out of OP's budget.
(assuming budget = £120)
 
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