CPU change; i5-8400 to i7-9700 problem.

pbrain

pbrain

pbrain

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I have a genral purpose PC running Windows 7, mainly for archiving music & videos. It had an i5-8400 and worked fine. I got hold of an i7-9700 and thought, same wattage, just drop in (after upgrading BIOS).
It worked fine for a short while, happy with the extra 2 cores. However, began a batch of FLAC conversions in FOOBAR and the screen went black and rebooted, no blue screen.
Tried again and same problem. I went into BIOS and did a 'restore to default settings'.
Still doing the same and even playing a VLC movie it will restart.
I did run HWMonitor and the one time it did a FLAC conversion, the peak power of the CPU hit 118W and max temperatures of 65'c, typically 20-40'c.
I can't find any info or log as to why it restarts, any ideas?
 
Did you clear the CMOS afterwards, or just use BIOS defaults?

Did you make sure that your memory was set to the same frequency, timings and voltage as prior to the BIOS restore defaults?

Have you checked you didn't accidentally unseat or make something loose when upgrading the CPU (thinking memory, graphics card and all power connectors)?

Did you change anything else with the system?

If you're worried about power draw, you could turn off turbo temporarily and see if it helps.
 
Tetras said:
Did you clear the CMOS afterwards, or just use BIOS defaults?

Did you make sure that your memory was set to the same frequency, timings and voltage as prior to the BIOS restore defaults?

Have you checked you didn't accidentally unseat or make something loose when upgrading the CPU (thinking memory, graphics card and all power connectors)?

Did you change anything else with the system?

If you're worried about power draw, you could turn off turbo temporarily and see if it helps.
Click to expand...
I just clicked on 'set default settings' in BIOS.
I've removed stick 1 & stick 2, set the timing to standard (not XMP). The RAM was also changed when I swapped the CPU (from 2x4G 3000mhz to 2x8G 3200mhz), still getting resets. I'll put the original 2x4G in tomorrow.
I also took out the old GTX960 and put in a GTX1060 (which converts movies quicker), I had the GTX1060 in before and took out to do some 8K testing in another rig.
The PSU is a Corsair 750W, so shouldn't be a problem there.
 
Mr Mcgoo said:
need a list of you whole pc as that cpu is quite a bit more power hungry over the 8400
Click to expand...
The Motherboard is a 'Z370 Aorus Gaming K3' I updated to latest BIOS before changing the CPU (F15 BIOS, 13th Nov 2021)
Corsair 750W PSU, GTX1060 Graphics, 2x 8Gb Ram 3200Mhz (was 2x4Gb 3000Mhz)
 
pbrain said:
I just clicked on 'set default settings' in BIOS.
I've removed stick 1 & stick 2, set the timing to standard (not XMP). The RAM was also changed when I swapped the CPU (from 2x4G 3000mhz to 2x8G 3200mhz), still getting resets. I'll put the original 2x4G in tomorrow.
I also took out the old GTX960 and put in a GTX1060 (which converts movies quicker), I had the GTX1060 in before and took out to do some 8K testing in another rig.
The PSU is a Corsair 750W, so shouldn't be a problem there.
Click to expand...
Have you run mem test to check for errors ?
 
It's an odd issue, sometimes it'll crash/reset when doing audio conversion (FLAC to WAV) and then it can crash/reset by simply right clicking on several files.
I do remember when the CPU (9700) was in it's previous motherboard it had issues; failing to boot into Windows(10), would take several attempts to load up.
I'm wondering if the BIOS is giving enough power to the CPU or if the CPU is faulty, how could I test it?
mickyflinn said:
Have you run mem test to check for errors ?
Click to expand...
I'll give it a try tomorrow, what utility would you recommend? years ago I had one that ran in DOS off a USB stick, can't remember what it was called.
 
pbrain said:
It's an odd issue, sometimes it'll crash/reset when doing audio conversion (FLAC to WAV) and then it can crash/reset by simply right clicking on several files.
I do remember when the CPU (9700) was in it's previous motherboard it had issues; failing to boot into Windows(10), would take several attempts to load up.
I'm wondering if the BIOS is giving enough power to the CPU or if the CPU is faulty, how could I test it?

I'll give it a try tomorrow, what utility would you recommend? years ago I had one that ran in DOS off a USB stick, can't remember what it was called.
Click to expand...
Memtest, Run off a usb stick.

www.memtest86.com

MemTest86 - Official Site of the x86 Memory Testing Tool

MemTest86 is the original self booting memory testing software for x86 and ARM computers. Supporting both BIOS and UEFI, with options to boot from USB.
www.memtest86.com
 
Something that hasn't been mentioned yet, but is the weight of your heatsink distributed evenly across the CPU? If there are screws to mount the heatsink to the motherboard, ensure that they are all tightened up evenly.

The pins on the CPU connect to the RAM and it only takes a heatsink which isn't mounted properly to cause problems, as some of the CPU pins might not be making proper contact.

While you're about it, remove the CPU and check all the pins in the CPU socket. Maybe even take a few photos and link us to them. Perhaps we might see something that you don't.
 
I did a memtest yesterday (3 hours) and that came back as a pass. I turned the PC off and came back to it later in the day. Booted up, logged in and after a few minutes went to 'My Computer' and right-clicked on network links and it done it again, black screen and reset. I doubt it's a heat issue; maximum temperature during the memtest was 84'c, typically mid 50's.
The cooler is a low profile scythe (which was in my Milo case) and quite light.
I've pulled the PC out and removed the BIOS battery, shorted the battery terminals and left it overnight without the battery. I'll re-install later today when I come back and see what happens. I had this problem when the CPU was in another ITX motherboard and I was sure it was a bad OS install (Win10)...it's now looking like a faulty CPU, but i've had it around 2-3 years and can't see anyone warrantying it after this long :(
 
pbrain said:
it's now looking like a faulty CPU, but i've had it around 2-3 years and can't see anyone warrantying it after this long :(
Click to expand...

Faulty Intel CPUs are pretty rare, especially 1151 CPUs, but they do come with a 3 year warranty when they're retail packaged. You can check your warranty status on Intel's website.
 
Tetras said:
Faulty Intel CPUs are pretty rare, especially 1151 CPUs, but they do come with a 3 year warranty when they're retail packaged. You can check your warranty status on Intel's website.
Click to expand...
I've just found my Overclockers receipt for the CPU. I bought it 5th Dec 2019 (retail boxed). It was for a portable gaming rig (Milo case) and never got it running properly. Because it wasn't my main PC, I just put it to one side and forgot about it and thought it was an installation problem. I doubt I still have the retail box (If kept all the PC boxes, I would fill a spare room!)
 
If you still have the 8400 then put that back in and check to see if you still have issues. If the pc works fine with the previous cpu in it then the 9700 is faulty, if you still have issues with the 8400 back in then the mobo is most likely faulty.

Motherboards develop faults more often than cpus so that is the most likely explanation but you need the original cpu to test for that.
 
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