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*** AMD "Zen 4" thread (inc AM5/APU discussion) ***

beta bios hasn't helped

ok so i changed PCI-e from 5th gen to 4th Gen, a little bit better, length between crashes are now further away, so that's a start

Going by what overclockers are telling me to do, they did mention power quality , extension leads etc etc

so i bought one of these :


coming Monday

top of the range surge protector in the UK as far as I can tell, nearly 3000 Joules

only £40 from Amazon

I'm thinking now that it could be "spiking" because if the prime 95, mem test and GPU stress test are saying everything is fine, motherboard has been swapped out, PSU has, memory has, using on board GPU and external ones
what's left ?

so im hopeing that will fix the issue
 
beta bios hasn't helped

ok so i changed PCI-e from 5th gen to 4th Gen, a little bit better, length between crashes are now further away, so that's a start

Going by what overclockers are telling me to do, they did mention power quality , extension leads etc etc

so i bought one of these :


coming Monday

top of the range surge protector in the UK as far as I can tell, nearly 3000 Joules

only £40 from Amazon

I'm thinking now that it could be "spiking" because if the prime 95, mem test and GPU stress test are saying everything is fine, motherboard has been swapped out, PSU has, memory has, using on board GPU and external ones
what's left ?

so im hopeing that will fix the issue
Seems like the only things you have not changed is the CPU and SSD. As a test, I would try setting the CPU to ECO 65W to limit max power a little, could also try a different SSD if you have a spare.
 
tried the ECO mode

no difference


so now , ive currently got

ECO mode

manual timings on RAM
36-38-38-auto 1.4v

PCI-E = 4th Gen instead of 5th Gen


come home and i got my surge protector here

plugged my PC into that which is on another extension lead from behind the cupboard, so i cant do directly

played my usual Project cars 2, 5 lap race

and it was STABLE, no problem what so ever
more testing to be done now !
 
Maybe time to get a new motherboard with AGESA 1.0.0.5 installed? Return the previous one if solves the problem.
 
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How is AGESA 1.0.0.5 by the way? Any stability issues?

I've been using 1.0.0.4 since release and it's been fine with a 7700X.

There's a rare bug that occurred every few days /weeks (didn't occur during stability testing) which seems to have been caused by one or more of the CPU cores boosting a bit too high (over 5.5ghz), since setting a core limit offset of -50 Mhz, the issue hasn't reoccurred.
 
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How is AGESA 1.0.0.5 by the way? Any stability issues?

I've been using 1.0.0.4 since release and it's been fine with a 7700X.

There's a rare bug that occurred every few days /weeks (didn't occur during stability testing) which seems to have been caused by one or more of the CPU cores boosting a bit too high (over 5.5ghz), since setting a core limit offset of -50 Mhz, the issue hasn't reoccurred.
If your system is working well on 1.0.0.4 on a non X3D part, stay there. 1.0.0.5 is for the X3D parts. No point updating the BIOS if everything is working fine. On my 7950X the 0805 Hero X670E BIOS was excellent and the best performing.
 
I've had my DDR5 setup at CL28 for a couple of months now, with other timings reduced also. I've been getting a consistent 56ns in Aida64 with a 7700X.

AMD still has some work to do here I think, as I could get 44ns on a 10700K + DDR4 @4000 Mhz.

I haven't compared cache latencies yet though... EDIT - The caches seem to be transferring more data per second than the Comet Lake system, particularly with L3 cache.

What is considered to be low memory latency on an AM5 system?
 
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I've had my DDR5 setup at CL28 for a couple of months now, with other timings reduced also. I've been getting a consistent 56ns in Aida64 with a 7700X.

AMD still has some work to do here I think, as I could get 44ns on a 10700K + DDR4 @4000 Mhz.

I haven't compared cache latencies yet though...

What is considered to be low memory latency on an AM5 system?
its why you buy a 7800x3d.
56ns is low amd wise due to different design choices using chiplets.
 
Weird thing, I've not had any disconnects since using a brand new ethernet cable (prior swap out was for another used) but what are the chances both were dodgy really. Not even applied the temp fix that was linked either as I'm now scared to jinx it.
 
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its why you buy a 7800x3d.
Don't think the vcache helps with latency, does it?

It didn't help with the 5800X3D (compared to the 5800X).

EDIT - So, it doesn't help at least when comparing the 7950X3D to the 7950X (with both untuned):

aida2-ryzen-9-7950x3d-performance.png
 
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