Question I can't run RAM at EXPO speed ?

[guzzerfree]

So I recently moved to AM5 with a Ryzen 8700g, an Asuus TUF GAMING B650M-E WIFI, 2 16G sticks of CL36 DDR5 Kingston Fury Beast with an EXPO speed of 6000Mhz, I'm running Linux, my issue is if I enable EXPO I will eventually get a green screen of death while gaming, sometimes after 10 minutes, sometimes after about 30 minutes, and I can't even run it at 5200Mhz without eventually getting a green screen of death, but its fine when its run at the stock speed of 4800Mhz.

I have no dedicated GPU, this is a completely passively cooled PC with a Noctua NH-P1, I didn't build it to be a dedicated gaming PC, but would like to get the most out of the iGPU if possible, is this some bios issue that could get resolved with a future update? or is it a ram issue? or a CPU silicon lottery issue? also I noticed without EXPO enabled my CPU temps have dropped by at least 10 degrees, going from around the low to mid 70's while gaming to the low 60's, is this an expected behaviour when enabling EXPO and going from around 1.1v to 1.35 to 1.4v? does enabling EXPO increase the voltage going to the CPU too?

I've also undervolted the CPU with a curve optimizer setting of negative 30, and set a TDC limit of 45, but the issue also happens without those settings applied, I'm also running the latest bios.

Thanks

 

[kurdtnz]

I had very similar issues when I moved to AM5, although I had a GPU. It took a BIOS update till I could finally run the RAM at 6000MHz without my games crashing. There are several EXPO profiles in the BIOS, have you tried them all? Also, I first tried -30 on all cores with the curve optimizer but my system wasn't stable, but they're fine with -25, that is down to each individual CPU and the silicon lottery.

 

[guzzerfree]

I had very similar issues when I moved to AM5, although I had a GPU. It took a BIOS update till I could finally run the RAM at 6000MHz without my games crashing. There are several EXPO profiles in the BIOS, have you tried them all? Also, I first tried -30 on all cores with the curve optimizer but my system wasn't stable, but they're fine with -25, that is down to each individual CPU and the silicon lottery.

Yep, I tried stock bios with no changes besides enabling EXPO, I tried EXPO 1, EXPO 2, EXPO tweaked, all those EXPO settings along with manually changing the ram speed to 5200, 5600, 6000, 6200, and 6400, no EXPO at all and just setting the ram speed manually, I tried copying buildzoids ram timings for ryzen ddr5 hynix, I can't seem to modify the ram speed at all without experiencing a green screen, I didn't try 5000, but I guessed there wouldn't be much difference between 4800 and 5000, plus by that stage I had gotten tired of experimenting, at least my temps are lower.

 

[guzzerfree]

I think I've solved it, when enabling EXPO it increased the SOC voltage to 1.24v, and the VDDIO/MC voltage to 1.45v, without EXPO enabled they were 1.11v for the SOC and 1.18v for the VDDIO, so I enabled EXPO and offset the SOC by 0.09v and set the VDDIO to 1.16v, which gives an actual voltage of 1.2v, now my ram is running at 6000 and I've not had any issues after 2 hours of gaming, where before I would be lucky to get 20 minutes before I got a green screen, I also offset the CPU core voltage by 0.09v and my temps are lower, now, sitting around 67 degrees while gaming on a completely passively cooled system.