The results from GPU benchmarks decreased following the CPU overclocking.
The results from GPU benchmarks decreased following the CPU overclocking.
Hey all,
I recently put together a rig for my nephew and have been having a play around with it to see how it runs, and as part of that I've been tinkering with the clocks a little to see what I can get out of the thing. Relevant specs are as follows:
AMD Ryzen 5 1600X
Corsair H100i Aio
16gb Corsair Vengeance RGB Pro (2 x 8) 3200mhz
EVGA SC GTX 970
Asus TUF B450M Plus Gaming
EVGA 850 GQ
I've been using Passmarks Performance Test 10 as my bench. I know, not exactly the best bench out there but it's one I'm familiar with, plus I'm only using it to get an idea of how much I've improved (or not) the different performance points of the system.
And so, this brings me onto my issue. At stock clocks the CPU (3.6ghz, 1.375V) and GPU (1317ghz GPU, 7010mhz Mem) scores were as follows:
CPU - ~13,000 (50-55C max temps)
GPU - ~8800 (65-70C max temps)
After OC'ing the GPU (1417mhz GPU, 7510mhz Mem) but NOT the CPU, the scores were as follows:
CPU - ~13,000 (as before)
GPU - ~10,000 (70-80C max temps)
Great news right? So then I turned my hand to the CPU and started fiddling with it's clocks, got it running stable (4.0ghz, 1.4V), ran the bench again and got the following scores:
CPU - ~14,000 (60-70C max temps)
GPU - ~8000 (65-70C max temps)
As I'm sure you can understand I was petty taken aback when I saw the staggeringly low GPU score after the CPU OC. The GPU clocks were still in their OC'd state, the only thing that had changed were the CPU clocks. I know from experience that sometimes power/thermal limits on the CPU can negatively affect GPU performance, however given the still more than reasonable CPU temps coupled with the fact that the score was improved modestly, I can't see this being the issue? However I will admit that this is my first time OC'ing a Ryzen based system so I won't be so bold as to assume I'm doing everything correct.
I will also note at this point that I reverted the CPU clocks back to default (as they were during my initial GPU overclock) and the GPU score went straight back up to where I expected it to be. So I'm certain it's something to do with my CPU overclock that's causing the issue.
So yeah, if anyone has any suggestions or could shed some light as to what's exactly going on here I'd very much appreciate it. Thanks in advance!
Many people get confused about power supply questions. The real focus should be on internal component quality, not wattage.
Regardless, you're doing well here:
http://www.jonnyguru.com/blog/2015/11/09...-supply/6/
Ha ha, yeah I get it. I always make sure to use quality PSUs, avoiding cheap or unbranded options that often cause problems. I stick to brands I know and trust. =)
What might be behind the reduced bench performance after overclocking the CPU? This is something I've never encountered before and I'm not sure what's causing it.
I'm not entirely sure, but understanding how the CPU and GPU interact might mean the overclocking isn't reliable. You've only tested a few samples, right? Is it consistent with what you've experienced?
Sorry, I might have needed to clarify earlier. The three samples I shared were just for context; I conducted several tests on different clocks and voltages, and the outcome is fairly consistent. As soon as I breathe on the CPU clocks, GPU performance drops significantly (as confirmed by the benchmarks).
I can't think it’s a major bottleneck issue overall, though. To be honest, this is my first time working with Ryzen, so I might not fully grasp all the details of its specific architecture.
I’m not too concerned about overclocking this setup, since it was a Christmas gift for my nephew living far away. I’ll just reset everything back to default before sending it over. It’s mostly just out of curiosity. Ha ha.
Attempt to progress to 4.0ghz – results at 3.7, 3.8, 3.9 – observe performance trends.
If the CPU OC remains inconsistent, any issues will affect the GPU as well.
Update:
Spent an hour or so running a few more tests after work, not conclusive by any means, I definitely still want to run more. Also I've swapped out the 970 for a 1060 just out of curiosity to see if I get similar results with a different GPU. All other aspects of the system remain unchanged.
Average CPU temps are 36C and average GPU temps are 50C. It's pretty hot over here right now, that coupled with my small office means it gets pretty toasty in here. I powered up and let the air temp in the room level out before conducting the tests. Anyhoo, here's what I've got so far results wise. Results are arranged as follows:
Bench score>average temp reached>average wattage reached
Reboot
Clocks as follows:
Memory: 2133mhz
CPU: 3.6ghz 1.375V
GPU: Core 1885mhz Mem 4006mhz 1.062V Power Target 100% Temp Target 83C
1st run
Mem: 2173
CPU: 12448 54C 70W
GPU: 10133 62C
2nd run
Mem: 2180
CPU: 12481 52C 70W
GPU: 9172 61C
3rd run
Mem: 2182
CPU: 12501 53C 70W
GPU: 10089 61C
Reboot
Clocks as follows (Only GPU Temp & Power Targets):
Memory: 2133mhz
CPU: 3.6ghz 1.375V
GPU: Core 1885mhz Mem 4006mhz 1.062V
Power Target 116% Temp Target 92C
1st run
Mem: 2168
CPU: 12601 53C 70W
GPU: 10055 61C
2nd run
Mem: 2164
CPU: 12638 62C 70W
GPU: 9164 62C
3rd run
Mem: 2200
CPU: 12615 53C 70W
GPU: 9174 62C
Reboot
Clocks as follows (Only CPU Clock):
Memory: 2133mhz
CPU:
3.8ghz
1.375V
GPU: Core 1885mhz Mem 4006mhz 1.062V Power Target 100% Temp Target 83C
1st run
Mem: 2156
CPU: 12780 73C 90W
GPU: 9276 61C
2nd run
Mem: 2156
CPU: 12768 73C 90W
GPU: 9771 61C
3rd run
Mem: 2183
CPU: 12754 73C 90W
GPU: 9213 60C
The mystery continues. Some anomalous results, not sure what to make of them. Though it is still an admittedly limited sample size so perhaps a more vigorous testing methodology is needed. What does surprise me is just how much the CPU temp and power draw went up after only bumping the multiplier up a couple notches. I haven't even touched the voltages yet. I wouldn't have thought that a simple .2ghz bump would result in a 20C rise in temps and a 20W jump in draw?
Anyway, I'll get around to running some more tests later, but for now that's all I've got to go on. Any thoughts?