GPU Crashing, fixed by lowering mem clock but i dont understand.

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Please have a read of this thread and understand my ordeal.
http://www.tomshardware.com/answers/id-3337416/gpu-fans-spinning-100-crash-startup.html

I've just gone into MSI afterburner and lowered the CORE CLOCK by 105 Mhz ( the maximum it allowed me to) From 1006 Mhz.

As well as Memory Clock from 3499 Mhz to 3000 Mhz.

The GPU would crash when CPU and GPU was put at 100% at the same time or used in a game.

KEEP IN MIND that the GPU would NOT crash with normal clock speeds when put under 100% load by its self.
Can someone please explain these questions i have below?

1. I bought this card off Ebay, a 780 Ti Asus 3gb, are these DEFAULT clock speeds normal?

2. Why does the card crash when the CPU and GPU are put under load or used in a game but do NOT crash when lowered to their maximum clock speed allowed by MSI afterburner.

3. In a game the TDP of the GPU is around 95% does that mean my 750W can not handle the GPU's power consumption and is not delivering enough W's to it? - If this is true, then with the combined power usage of the CPU and GPU at 100% with normal clock speeds, causes the crash i could assume? OR when lowering the clock speed of the GPU, it does not use enough power to crash when the CPU and GPU is put to 100%?

 

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I felt as if this was an entirely different problem, related to core clocks on the actual GPU. Not the reason of my two other threads trying to pinpoint the reason of the crashes relating to each component and gain advice on how components failures can affect each other as well as my other separate issue of my PSU malfunction.
 

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Temp's seem to be fine, always running under 65C
Even just jumping the Core clock up to default values makes the GPU crash.
 

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i7 2600k 3.4 Ghz Stock, OC to 3.6 Ghz.
50- 60 C under load - Cpu temp
50- 60 C underload -Gpu temp
Coolermaster 750W, cheap make PSU.
 


It seems as though it's all related and as such if you kept it all to a single thread it might be easier for folk to help you pinpoint the issue.
 

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Thank you Monkey, in future i will keep it in all one thread, i understand it may seem annoying seeing so many threads posted by me. I apologize sincerely!