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7900 XTX compatibility with PSU

Sinbad56

Sinbad56

Sinbad56

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Joined
5 Apr 2020
Posts
25
Recently build a new 7900 XTX build and being having some issues where the system will crash mid game and reboot. It only seems to happen with one particular game (Dota 2) but it will happen pretty consistently - the game will run fine for 30-40 minutes before the system will randomly crash and reboot.

I am wondering whether the issue is related to my PSU. The 7900 XTX takes 3x 8 pin but the PSU only came with 2x 2x 8 pin (4 connection total from 2 cables). When I first built the PC I had it set to use 3 of the 4 connections (1 cable with 1 connection and the 2nd cable with two connections daisy chained). For context I also had the 8 pin and 4 pin connectors both plugged into the MOBO for the CPU (7800x3d) which meant all the PCIe slots on the PSU were utilised.

Everything seemed to work fine but I'd read not to daisy chain so I decided to purchase 3x 8 pin connector for a well know cable modding business (ahem). I removed the 4 pin CPU connector to free up a PCIe slot on the PSU and then replaced the 2 cables from the PSU with the 3x 8 cables.

Since doing this, the issue with reboots has started to occur.

I expected that switching cables would have been a better setup as I was no long daisy chaining but this does not seem to be the case.

Any thoughts or advice would be appreciated. I could switch back to the original cable setup to see if that resolves the issue, or is the issue the PSU is not being compatible in the first place? The website for the PSU indicates that it supports GPUs which takes 3x 8 pin connectors but this doesn't seem to match how it is set up.

GPU - https://www.overclockers.co.uk/sapp...ddr6-pci-express-graphics-card-gx-3a4-sp.html
PSU - https://www.overclockers.co.uk/ther...ie-5-80-plus-gold-power-supply-ca-1bn-tt.html
 
Sinbad56 said:
Since doing this, the issue with reboots has started to occur.

I expected that switching cables would have been a better setup as I was no long daisy chaining but this does not seem to be the case.

Any thoughts or advice would be appreciated. I could switch back to the original cable setup to see if that resolves the issue, or is the issue the PSU is not being compatible in the first place? The website for the PSU indicates that it supports GPUs which takes 3x 8 pin connectors but this doesn't seem to match how it is set up.
Click to expand...

Switch back to the original cables, even though it is daisy chained. I'd expect that PSU to have no problems with your card.
 
Sinbad56 said:
Recently build a new 7900 XTX build and being having some issues where the system will crash mid game and reboot. It only seems to happen with one particular game (Dota 2) but it will happen pretty consistently - the game will run fine for 30-40 minutes before the system will randomly crash and reboot.

I am wondering whether the issue is related to my PSU. The 7900 XTX takes 3x 8 pin but the PSU only came with 2x 2x 8 pin (4 connection total from 2 cables). When I first built the PC I had it set to use 3 of the 4 connections (1 cable with 1 connection and the 2nd cable with two connections daisy chained). For context I also had the 8 pin and 4 pin connectors both plugged into the MOBO for the CPU (7800x3d) which meant all the PCIe slots on the PSU were utilised.

Everything seemed to work fine but I'd read not to daisy chain so I decided to purchase 3x 8 pin connector for a well know cable modding business (ahem). I removed the 4 pin CPU connector to free up a PCIe slot on the PSU and then replaced the 2 cables from the PSU with the 3x 8 cables.

Since doing this, the issue with reboots has started to occur.

I expected that switching cables would have been a better setup as I was no long daisy chaining but this does not seem to be the case.

Any thoughts or advice would be appreciated. I could switch back to the original cable setup to see if that resolves the issue, or is the issue the PSU is not being compatible in the first place? The website for the PSU indicates that it supports GPUs which takes 3x 8 pin connectors but this doesn't seem to match how it is set up.

GPU - https://www.overclockers.co.uk/sapp...ddr6-pci-express-graphics-card-gx-3a4-sp.html
PSU - https://www.overclockers.co.uk/ther...ie-5-80-plus-gold-power-supply-ca-1bn-tt.html
Click to expand...
During my investigation, I was in the market for a new PSU; I found most of these new ATX.30 PSU only had 4 PCIe/CPU connections, and it's always best to have individual cables going to each connector on the GPU. I wanted a flexible PSU with the 12VHPWR connection because I just had a feeling this was going to change and it did. I too, have a 7900 XTX with an aged PSU EVGA Supernova G2 so I upgraded to a Seasonic PX-1600 massively too much for my build but I have no intention of buying another PSU for the next 12 years.

There were very few PSU with more than 4 PCIe/CPU and with the new change again to the 12VHPWR to 12V-2x6 its best to get a PSU that has more than 4 PCIe/CPU.
See Hwbusters - No More 12VHPWR Connector! Say hi to 12V-2×6 - Hardware Busters (hwbusters.com) and How to Select a new PSU with the upcoming 12VHPWR change? - Hardware Busters (hwbusters.com)

In your situation contact Thermaltake if you are outside the return window for the retailer, if you are in the window return it and get a PSU with more than 4 PCIe/CPU.
 
Tetras said:
Switch back to the original cables, even though it is daisy chained. I'd expect that PSU to have no problems with your card.
Click to expand...
Thanks. I'm going to try this and see it is makes a difference as it's the only think I can think of which has changed.

It's a bit of a strange one (at least to a novice like me). It runs fine under stress testing, but then it will randomly reboot during gaming when it's not even under too much load.
 
You could try some different driver revisions, I had something similar with a vega64 card and it was a driver issue.
 
you have to take into account the transient spikes the gpu can pull, but tbh you only need a 8pin eps cable to power the 7800x3d you have, then you can use the spare psu connector and use a 3rd gpu cable to go to the gpu, avoiding the need to use a daisy chain for the gpu. try the above and see if the issues stop

nvm i just checked your psu and you only have 2 daisy chain pcie cables, only option is a new psu with more 8pin plugs that support eps cpu power/gpu power
 
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wookiee87 said:
you have to take into account the transient spikes the gpu can pull, but tbh you only need a 8pin eps cable to power the 7800x3d you have, then you can use the spare psu connector and use a 3rd gpu cable to go to the gpu, avoiding the need to use a daisy chain for the gpu. try the above and see if the issues stop

nvm i just checked your psu and you only have 2 daisy chain pcie cables, only option is a new psu with more 8pin plugs that support eps cpu power/gpu power
Click to expand...
Do you have any recommendations? I’ve tried to have a look but I struggled to see which ones were suitable.

I do have 3 gpu cables. They didn’t come with the psu but I brought them from a third party side (where they were marketed as being suitably specifically for my PSU)
 
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Sinbad56 said:
Do you have any recommendations? I’ve tried to have a look but I struggled to see which ones were suitable.

I do have 3 gpu cables. They didn’t come with the psu but I brought them from a third party side (where they were marketed as being suitably specifically for my PSU)
Click to expand...

ah, if you have the 3rd party cables try that as a quick solution, take out the eps 4 pin cable to the cpu, plug the 3 gpu power cables in and see if the crashing/reboot goes away.
when the pc does reboot do all the fans go turbo mode and sound like a jet engine?
 
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wookiee87 said:
ah, if you have the 3rd party cables try that as a quick solution, take out the eps 4 pin cable to the cpu, plug the 3 gpu power cables in and see if the crashing/reboot goes away.
when the pc does reboot do all the fans go turbo mode and sound like a jet engine?
Click to expand...
Sorry if I wasn't clear before, but that's exactly what I did and this issue only seemed to start happened AFTER I switched to the 3 3rd party gpu cables and removed the eps 4 pin. It could be a complete coincidence but the timing lines up.

The fan don't go turbo mode. It will literally reboot and then the fans will spin up like they do on normal boot up.

Do you think not having the eps 4 pin could be the issue?

I think my best bet is to revert back to how I had it originally and see if the issue goes away

Edit: for typos
 
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ah whoops my bad, the 3rd party cables that you bought, you sure they are 100% compatible with your unit?, sounds like they may be wired up to a degree that they work at idle loads and such but under more powerful situations something may be tripping your psu, causing the reboots, just to test i would install the original cables and see what happens
 
wookiee87 said:
ah whoops my bad, the 3rd party cables that you bought, you sure they are 100% compatible with your unit?, sounds like they may be wired up to a degree that they work at idle loads and such but under more powerful situations something may be tripping your psu, causing the reboots, just to test i would install the original cables and see what happens
Click to expand...
They wee advertised as that but I guess there's no way for me to tell.

I'll try the old set up and see what happens.
 
ah thers the problem t-series are for the 12000w and lower models and the tgl are for the 1350 to 1650w modles they are unfortuantly not cross compatible avoid using the 3rd party cables at all costs, what you need is the t-series they work with all wattages upto 1200w on the GF3 series, the ground is very muddy tbh the 1350-1650w are also in the GF3 naming scheme but lower down on both product pages there is a warning to say dont buy for lower or higher watt units depending which page you look at
 
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wookiee87 said:
ah thers the problem t-series are for the 12000w and lower models and the tgl are for the 1350 to 1600w modles they are unfortuantly not cross compatible avoid using the 3rd party cables at all costs, what you need is the t-series they work with all wattages upto 1200w on the GF3 series, the ground is very muddy tbh the 1350-1600w are also in the GF3 naming scheme but lower down on both product pages there is a warning to say dont buy for lower or higher watt units depending which page you look at
Click to expand...
Sounds like this could be the issue then. I switch back to what I had originally with the daisy chained setup until I can source some t series cables then
 
had a quick look around but all the sets i can see only bundle the 16pin gpu cable and no traditional 8 pin pcie cables, you may have to use the configurator and build your own set, that way you can get exactly what you want, just be sure to input your exact psu from the drop down menu, follow some extra steps and you can start adding cables and custom lenghts
 
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wookiee87 said:
had a quick look around but all the sets i can see only bundle the 16pin gpu cable and no traditional 8 pin pcie cables, you may have to use the configurator and build your own set, that way you can get exactly what you want, just be sure to input your exact psu from the drop down menu, follow some extra steps and you can start adding cables and custom lenghts
Click to expand...
That's what I did before and it come as with the TGL series as being the right ones
 
The other thing I was wondering is, does it matter which CPU / PCI-e slot I use for the CPU and which ones I use for the GPU. Just trying to think of any others way I might have messed the install up.


 
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