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VRM on the new AM4 motherboards - Page 118

post #1171 of 1990
Did a video. Peak temps were within 2c with ir back of board..
post #1172 of 1990
Quote:
Originally Posted by hojnikb View Post

Pretty much. As you can see from every datasheet out there, vrms are rated for current, not power thumb.gif

Power is a function of amps and volts. So the two are directly related given that we know the voltage range for the chips because current times voltage equals power.

Ryzen does not seem to be able to scale with voltage to the point where the VRM will be the main limiting point. Very high 3ghz OC's are possible with the eight core chips on four phase (4+2) boards without much issue.
Edited by KarathKasun - 4/27/17 at 1:20pm
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post #1173 of 1990
Quote:
Originally Posted by bardacuda View Post

Wow. Hard to believe the sink could be that bad though. The ones on the X370 Gaming boards don't really look any different than the one on my board, and I think the hottest temp I've seen is 63°C in IBT Max @ 1.4V with a 24°C ambient. Did they forget to use metal for the material? lol.
I guess the 'fets just run that much hotter.

EDIT: Wait, though, didn't you measure them with IR and were seeing 40-something when software was reporting 60-something? Maybe the Gigabyte boards are actually measuring choke temp instead of mosfet.

 

Heatsink surface temperature is greatly different to package temperature.

   
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post #1174 of 1990
Quote:
Originally Posted by Artikbot View Post

Heatsink surface temperature is greatly different to package temperature.

Exactly.

@chew*

I watched the video but it looked like you were measuring the back of the chokes or caps. If your IR thermometer is anything like mine, it actually measures the temp about 3/4" "below" where the laser is, but you had the unit rotated to the left, so I think it was measuring the temp to the right of the laser.

Maybe I just find it hard to believe the heatsink could be that ineffective. I could see if there were fets on the low side that didn't have a sink/airflow on them but that wasn't the case for that board as far as I could tell. I really think the sensor might be reporting choke temps.
Edited by bardacuda - 4/27/17 at 2:22pm
post #1175 of 1990
Quote:
Originally Posted by Karagra View Post

My CPU is only around stock voltage due to the chip and board allowing that for 3.9ghz. Also Im guessing I should just run a Small FFTs test for a few hours then repost?
No, Prime is not REALLY pushing Ryzen's.

Run OCCT configured with 10 minutes or more + Linpack+ AVX + Idle time=0.
post #1176 of 1990
Quote:
Originally Posted by DADDYDC650 View Post

That's the reading I get from the VRM's on my board after running P95 blend for 30 minutes. Haven't tried other stress test. What temps are you getting when running P95 blend?

During prime test runs there are sections that produce a lot less heat. temp drops are easily ~10c or more quickly. For me right now that's with open air, not a case and there's a 120mm fan on the vrm area cranked to 2000rpm. Ambients are mostly seasonal weather in the "temperate" rain forest of the PNW. (bah!) Fans at full I can tell when the load is lighter because of the temp drop, if on pwm curve other than full speed they get quieter. chew* noted he was on a quieter /less heat producing part of prime test run during his video. Run prime often enough I expect one comes to recognize it.

So depending on where I am in the test, after 30 minutes of prime these vrm's can be anywhere from 60-75c ish.. Or rather the anonymous sensors 3, 4, 5 and 6 are.
Motherboard sensor does not follow them. They go up when cpu gets load, do not match cpu, come down when cpu load drops.

I kinda wonder where temp sensors are. Like mine specifically. Workin on it but it's not a priority. Fighting with timings at 3200 dropping cpu to lower speeds. test. run prime. watch temps and cpu utilization less than 100% tells me my test is over.

I'm really doubtful my less expensive wee board has 4 unnamed sensors. But maybe if my motherboard sensor looks like the crosshair motherboard sensor and lives in roughly the same place there will be something that looks 'close enough' or 4 of them. Not a lot of places to look on mATX. It'll turn up. if I put enough effort into it. Course that's only good for me, the board I have in front of me and hopefully it's near kin. The other asus prime b350m variants living in prebuilt machines . Maybe those get heatsinks or something.
Quote:
Originally Posted by virpz View Post


No, Prime is not REALLY pushing Ryzen's.

Run OCCT configured with 10 minutes or more + Linpack+ AVX + Idle time=0.

Prime works if you set it right but for overall stability small ffts nope.

occt linpack avx with idle 0 at ten minutes or more. sounds brutally long. wheee.gif
post #1177 of 1990
Well, just ordered a motherboard with the worst VRM possible on AM4. The MSI B350M Gaming Pro, because it was on sale for $70 USD.

Going to be using it with an R5 1400, will put up some results after it comes in and I can get to testing it. Expecting 3.8-3.9ghz with no problems considering the 4c/8t chips are likely a bit around 60% of the VRM load presented by the 8c/16t chips.
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post #1178 of 1990
Quote:
Originally Posted by KarathKasun View Post

Well, just ordered a motherboard with the worst VRM possible on AM4. The MSI B350M Gaming Pro, because it was on sale for $70 USD.

Going to be using it with an R5 1400, will put up some results after it comes in and I can get to testing it. Expecting 3.8-3.9ghz with no problems considering the 4c/8t chips are likely a bit around 60% of the VRM load presented by the 8c/16t chips.

It's been paired with R7's but I'm afraid to look for the results.
I saw the design, looked twice. Decided the lack of heatsinks on the asus board weren't such a horrible drawback in comparison.... After all the OTHER two asus wonderboards without heatsinks worked so well for me doh.gif
post #1179 of 1990
Quote:
Originally Posted by yendor View Post

It's been paired with R7's but I'm afraid to look for the results.
I saw the design, looked twice. Decided the lack of heatsinks on the asus board weren't such a horrible drawback in comparison.... After all the OTHER two asus wonderboards without heatsinks worked so well for me doh.gif

VCore has a heatsink on that board. VSOC doesn't, but without powering an iGPU it should not be a problem.
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post #1180 of 1990
Quote:
Originally Posted by yendor View Post

During prime test runs there are sections that produce a lot less heat. temp drops are easily ~10c or more quickly. For me right now that's with open air, not a case and there's a 120mm fan on the vrm area cranked to 2000rpm. Ambients are mostly seasonal weather in the "temperate" rain forest of the PNW. (bah!) Fans at full I can tell when the load is lighter because of the temp drop, if on pwm curve other than full speed they get quieter. chew* noted he was on a quieter /less heat producing part of prime test run during his video. Run prime often enough I expect one comes to recognize it.

So depending on where I am in the test, after 30 minutes of prime these vrm's can be anywhere from 60-75c ish.. Or rather the anonymous sensors 3, 4, 5 and 6 are.
Motherboard sensor does not follow them. They go up when cpu gets load, do not match cpu, come down when cpu load drops.

I kinda wonder where temp sensors are. Like mine specifically. Workin on it but it's not a priority. Fighting with timings at 3200 dropping cpu to lower speeds. test. run prime. watch temps and cpu utilization less than 100% tells me my test is over.

I'm really doubtful my less expensive wee board has 4 unnamed sensors. But maybe if my motherboard sensor looks like the crosshair motherboard sensor and lives in roughly the same place there will be something that looks 'close enough' or 4 of them. Not a lot of places to look on mATX. It'll turn up. if I put enough effort into it. Course that's only good for me, the board I have in front of me and hopefully it's near kin. The other asus prime b350m variants living in prebuilt machines . Maybe those get heatsinks or something.
Prime works if you set it right but for overall stability small ffts nope.

occt linpack avx with idle 0 at ten minutes or more. sounds brutally long. wheee.gif

I can get 100% utilization with both tests but obviously they do not run the same on Ryzen... In my experience the OCCT in the before mentioned settings ( pick your time, that was just an example ) is putting my Ryzen to sweat a little more if compared to prime95, no matter FFT sizes I set.

I've been using prime95 for way more than a decade now but I sure can still learn some tricks about it. Mind to teach me ? tongue.gif
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