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How to downgrade HP Z400 bios from 3.61 to 3.60 because GPU gets hot in idle

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Z400 Workstation
Microsoft Windows 10 (64-bit)

Hi, I updated my old bios (3.57 i believe) because i switched from an xeon w3565 to a xeon x5690 so my gtx970 doesn't get bottlenecked.


Now my GPU stands at 60°-70°C while doing nothing.


It is also possible that just getting a better power supply would fix this since i am pretty much at my psu limit 475W..


But i want to try to downgrade my bios to older versions to see if the problems exists mainly because of the bios version.


How do I do that? When i try to select older versions via F10 Usb flash it says they are not valid (because they are older)

Thanks a lot for your help!!


Edit: When i play some games the GPU only like 55°C hot... so its the psu?

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Message 2 of 3
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In my opinion doing a bios downgrade will have no effect on your video card temperatures and trying to do so risks the system becoming a brick as a forced downgrade of the bios is full of risks


the xeon w3565 is a130 W part, the xeon x5690 is the same wattage, but has 2 more cores

some z400 systems came with the high performance cooler and some did not check which one you have the preferred one  has 3 heatpipes 


the stock 970 is factory rated for up to 98c and is a 145 watt part the fans do not kick in until the temp is over 60c my idle temp was around 56c-58c until i replaced the stock cooling with a aftermarket kit


if you want lower cpu/gpu temps check the system airflow, the card fan/heatsink, run a app to control the video card fan curve, increase the z400 default bios fan setting or replace the video cards current cooler/fan setup with a aftermarket setup


or water cool it (this kit requires a pump also see picts)

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Message 3 of 3
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The Z400 version 2 with a high end processor (now inexpensive) still has life left in it.  Agree with DGroves that downgrading BIOS is not the way to go.  You must have the later better version 2 Z400 to be running the X5690, which is what I used on all of the Z400 upgrades I have done.  However do double check on the heatsink/fan you put over that upgraded processor.  If you started with the "mainstream" rather than the "performance" heatsink/fan you have a problem that you need to fix.  Luckily the performance heatsink/fan units are inexpensive due to the large number available.


Here's some added hardware information.  I'd put priority on adding a front "PCI" intake fan/card guide and the air flow guide posted about  HERE .  I've done both in all the Z400 souped up builds from the past.


The vast majority of Z400 workstations came with the higher cooling capacity larger heatsink/fan.  Read up on that in the link... I also added on a northbridge fan to the finned heatsink already present (there is a 4-pin spare motherboard header for that conventional PWM fan).  Plus, added a HP "2x2" PCIe Texas Instruments chipset USB3 card as posted about here.  Nice project workstation, typing on one right now.

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