Question Bad CPU?

[jck77]

Recently purchased a used i7 4790k off Amazon and had it go out within 2 weeks. Was using the computer one evening. Shut it down. Got up the next morning. Turn it back on and it wouldn't post, thought it might be RAM or something else but nothing seemed to help so I took the chip out. Put my old i5 chip in and it fired right up. Power cycled everything replaced the chip at the i-7 back in and it still wouldn't post, so I did a return and shipped it back to Amazon and got a message from the seller with a picture showing it posted and working on their machine. He said it was probably my power supply going bad but if that's true how can my I-5 chip still be working in the machine?

 

[rgd1101]

What your full system spec? include brand and model of the psu

 

[jck77]

What your full system spec? include brand and model of the psu

I'll get back to you when I get to the house. I know the board is an msi z97s sli krait edition, just not sure about the power supply off the top of my head. Current working CPU is I5 4690k.

 

[jck77]

What your full system spec? include brand and model of the psu

MSI Z97s sli krait edition MB, Aspire ATX AS520watt psu, GeForce GTX 1050ti, 16gb 1600 mhz ram, i5 4690k. As is it's working fine, but after putting in the I7 4790k and it worked for about a week and then quit posting. The place I returned it to put it in there machine and had no issues. They're tell me I have a bad psu, but why would my old chip still work? Same wattage for both.

 

[DSzymborski]

TDP isn't precisely the same as power consumption and it's at base frequency all cores.

I normally wouldn't suspect the PSU for such a small difference except for the fact that your PSU is such a low-quality one that I wouldn't want to make any categorical statements without testing with a PSU that, well, isn't garbage. Returns may be a little trickier now; if you told the seller what PSU you were using, they're far more likely to think -- and have a stronger case -- that if the CPU is damaged, it was something that happened on your end, not a bad CPU being sent.

 

[jck77]

TDP isn't precisely the same as power consumption and it's at base frequency all cores.

I normally wouldn't suspect the PSU for such a small difference except for the fact that your PSU is such a low-quality one that I wouldn't want to make any categorical statements without testing with a PSU that, well, isn't garbage. Returns may be a little trickier now; if you told the seller what PSU you were using, they're far more likely to think -- and have a stronger case -- that if the CPU is damaged, it was something that happened on your end, not a bad CPU being sent.

Ok, thanks for the explanation. What would your recommendation be for a new psu?