AMD Ryzen CPU

[TequilaChaser]

I am with you TC, on the temperature issue.  I have my home computer set to alarm if the CPU temperature breaks 40C.  It is usually in the low 30's.

Rgr, you must've been posting as I edited in what those older 2011 builds would run at, running stock clocks

Edit: and don't think I ran those 2011 builds overclocked like that all the time.... after I had built the Intel build, I wanted to see just how far I could push each build and keep it stable for several runs of 12 hrs straight, then 18 hrs straight and a final test for 24 hours straight....then I set everything back to stock factory clocks and haven't overclocked either of them since....they both are still performing excellent still currently

[Vinkman]

Is your RAM faster than 2400? My Corsair sticks are tested to 2666, and I'm running them at 2666. My Asus Crosshair VI MB can run RAM at 3200, but I haven't bothered trying to overclock the RAM. The performance gains are marginal. If you're on the same MB as me then you may need to update your BIOS. I've updated it twice now. Check asus.com.

I have an ASUS Prime B350 Plus AM4. It says it can handle 2666 RAM. My Corsair RAM is 3200MHz capable at 14 CAS. I'm not sure I tried 2666, now I that I think about it. I think I tried one of th e3K speeds like 3133MHz. 

I found the RAM speed made a big difference when I sped it up so I want to get as much out of it as I can. Looks like 2666MHz is the limit of this board.

[PR3D4TOR]

The Ryzen 1700X and 1800X offset the tCTL readings by 20C, so a build that reads 60C is really only at 40. Mine reads 40-45 at idle and between 60 and 70 at full load. The Ryzen heat-throttles itself at 95C. 8 cores, 8 times the heat production of an old single core CPU.

[Skuzzy]

Mine is a hyper-threaded quad core, not a single or dual core (Intel i7-4770k).

So is it just arbitrary to add 20C to the temperature reading?  Why would they do that?  Really, just curious.

[PR3D4TOR]

"The primary temperature reporting sensor of the AMD Ryzen™ processor is a sensor called “T Control,” or tCTL for short. The tCTL sensor is derived from the junction (Tj) temperature—the interface point between the die and heatspreader—but it may be offset on certain CPU models so that all models on the AM4 Platform have the same maximum tCTL value. This approach ensures that all AMD Ryzen™ processors have a consistent fan policy.

Specifically, the AMD Ryzen™ 7 1700X and 1800X carry a +20°C offset between the tCTL° (reported) temperature and the actual Tj° temperature. In the short term, users of the AMD Ryzen™ 1700X and 1800X can simply subtract 20°C to determine the true junction temperature of their processor. No arithmetic is required for the Ryzen 7 1700. Long term, we expect temperature monitoring software to better understand our tCTL offsets to report the junction temperature automatically."

More here: https://community.amd.com/community/gaming/blog/2017/03/13/amd-ryzen-community-update

[Vinkman]

I am with you TC, on the temperature issue.  I have my home computer set to alarm if the CPU temperature breaks 40C.  It is usually in the low 30's.

I was very concerned about temps and have spent a fair amount of time on fan directions, speeds and flow through the case. I have the CPU cooler fans set to the highest setting of the three options. But I haven't found a manual setting yet. I found that all of these auto fan settings let things get to hot and don't speed up the fans enough. My Graphics card would get to 70c on auto, so I manually set it for 80% fan speed all the time and it runs at 37-45c, and sounds like a dust buster. I'll play with the fan optimizers software and see if it produces better results, or until I find the manual setting for the CPU fans.


I looked up Ryzen temperatures online and saw some crazies running 85c and one guy said he set his alarm for 90c because the Ryzen chipset will die at 95c. Those numbers seemed stupid high to me so I ignored them. 

I'll keep tweaking. Thanks for the advice as always. 

[Skuzzy]

"The primary temperature reporting sensor of the AMD Ryzen™ processor is a sensor called “T Control,” or tCTL for short. The tCTL sensor is derived from the junction (Tj) temperature—the interface point between the die and heatspreader—but it may be offset on certain CPU models so that all models on the AM4 Platform have the same maximum tCTL value. This approach ensures that all AMD Ryzen™ processors have a consistent fan policy.

Specifically, the AMD Ryzen™ 7 1700X and 1800X carry a +20°C offset between the tCTL° (reported) temperature and the actual Tj° temperature. In the short term, users of the AMD Ryzen™ 1700X and 1800X can simply subtract 20°C to determine the true junction temperature of their processor. No arithmetic is required for the Ryzen 7 1700. Long term, we expect temperature monitoring software to better understand our tCTL offsets to report the junction temperature automatically."

More here: https://community.amd.com/community/gaming/blog/2017/03/13/amd-ryzen-community-update

Thank you.  Interesting,.....odd,....but interesting.

[Vinkman]

"The primary temperature reporting sensor of the AMD Ryzen™ processor is a sensor called “T Control,” or tCTL for short. The tCTL sensor is derived from the junction (Tj) temperature—the interface point between the die and heatspreader—but it may be offset on certain CPU models so that all models on the AM4 Platform have the same maximum tCTL value. This approach ensures that all AMD Ryzen™ processors have a consistent fan policy.

Specifically, the AMD Ryzen™ 7 1700X and 1800X carry a +20°C offset between the tCTL° (reported) temperature and the actual Tj° temperature. In the short term, users of the AMD Ryzen™ 1700X and 1800X can simply subtract 20°C to determine the true junction temperature of their processor. No arithmetic is required for the Ryzen 7 1700. Long term, we expect temperature monitoring software to better understand our tCTL offsets to report the junction temperature automatically."

More here: https://community.amd.com/community/gaming/blog/2017/03/13/amd-ryzen-community-update

I have a 1800x so perhaps I'm actually running in the low 40s. But I'm pulling those temps right of the Ryzen Master control panel. Why wouldn't they bake that into the software that reports the temp?

[PR3D4TOR]

Mine is a hyper-threaded quad core, not a single or dual core (Intel i7-4770k).

I didn't think your hardware was so old that you were still on a single core. It was just better to compare 8 for 8. However, with the same architecture an 8-core CPU will require twice the power and produce twice the heat of a quad-core. And all that heat must be transferred through the same size die and heat spreader to the cooling block. There's an obvious heat bottleneck there.

[PR3D4TOR]

I have a 1800x so perhaps I'm actually running in the low 40s. But I'm pulling those temps right of the Ryzen Master control panel. Why wouldn't they bake that into the software that reports the temp?

I have no idea. I use the MB temp readings since they're more consistent at this time. It's a brand new architecture and there are stuff that still needs to be ironed out. One thing though is that there is no "unsafe" temperature within the thermal margin. It is perfectly safe to operate in the full envelope of the thermal margin. When thermal margin runs out, your CPU will throttle to a lower power state until back in the thermal margin. So 60-70C under load is perfectly fine since the Ryzen's thermal margin runs out at 95C.

[Skuzzy]

I didn't think your hardware was so old that you were still on a single core. It was just better to compare 8 for 8. However, with the same architecture an 8-core CPU will require twice the power and produce twice the heat of a quad-core. And all that heat must be transferred through the same size die and heat spreader to the cooling block. There's an obvious heat bottleneck there.

Not quite, but close.  There is a percentage of shared transistors, in the CPU, which do not get multiplied for each core.  The ratios can range from 2 to 1 all the way to 8 to 1.  For example, a large portion of the memory manger does not get multiplied with each core as when memory it being accessed, only one core at a time can access it so it does not make any sense to multiply those transistors across the die for each core.  Same goes for the instruction manager who handles instruction prefetch and branching.

[Vinkman]

This is the perfect CPU for me. I do a lot of video editing and gfx work, and instead of spending $2000 on an i7 6950X i get a whole computer for that! Great gaming rig too.



https://youtu.be/ed4GZ61B0yg

Is this your rig? or one you want to build? 

[PR3D4TOR]

Not quite, but close.  There is a percentage of shared transistors, in the CPU, which do not get multiplied for each core.  The ratios can range from 2 to 1 all the way to 8 to 1.  For example, a large portion of the memory manger does not get multiplied with each core as when memory it being accessed, only one core at a time can access it so it does not make any sense to multiply those transistors across the die for each core.  Same goes for the instruction manager who handles instruction prefetch and branching.

As close as makes little difference.

[PR3D4TOR]

Is this your rig? or one you want to build? 

My rig, when it was still in my attic "shed" and I turned it on for the first time. First video I made with the new rig as well.

[Vinkman]

My rig, when it was still in my attic "shed" and I turned it on for the first time. First video I made with the new rig as well.

Cool. Nice build. Our rigs are very similar except the vid card. Are you getting better performance than mine based on some of the things I've posted?