Hi everyone, new user here, been reading Anand from the very beginning though! - im 43!
Just built a new home workstation mainly for Cinema4d and Cubase, I cant wait any longer for a 3900x so I bought a 3700x and will upgrade when supply is a bit better.
So I maybe won the silicon lottery??
My 3700x overclocks to 4.25ghz allcore at 1.275v on my asus b450 prime with stock cooling, and scores 5127 in CB20. I also stress tested this profile in Cinema4D with a 4 hour intense render, and its stable at 1.275v, whereas CBr20 will pass at 1.25v easily at this speed. Under these conditions in a poorly ventilated case (soon to be upgraded) i hit 80C and HWmonitor records Im using a pretty straight 100 Watts package.
I can allcore OC all the way up to 4375ghz at 1.45v, but 4.4 is not stable, and im not willing to push the voltage higher.
However Im very pleased with the results regardless. Very happy I can run 4.25ghz all-core all day, - turbo speed is not so important to me, and im only 125mhz off the turbo (max on PBO is 4375) which is negligible <3%, but I gain 8% in multicore.
So here are some observations, maybe to comment on
• When I originally built the system, under pre-OC conditions, it would boost allcore to 3975mhz under cinebench. After a day of OC testing, it only boosts to 3925mhz. Ive lost 50mhz across all cores somehow. Have I degraded the CPU?
• Under stock, I use 88W and get standard scores in CB20 of around 4600, where the allcore boost is around 3950mhz and occasional boosts to 4300+ mhz
However, if I set 4.2ghz all core at 1.2v, I can easily score 5000+, using essentially the same 90W - is PBO wasting power to hit those rapid but very short lived highs?
• Power usage goes up rapidly over 1.25v for little increase in speed or performance.
• When running Cinebench, the power usage goes up to 105W with all 8 cores maxed at 100%, however when I stress test in C4D over 4 hours with any scene I create, the power draw never goes above 100W. Is there something fishy going on with gimping the results in CB at the MB level?
• Increasing the voltage lowers the per core wattage! - for instance under stock conditions with PBO, the cores use around 9W each with the remaining power consumed by the chiplet controller I assume. Under my overclock, I notice that the cores are using around 8W each, but the total power consumption increases, meaning that the controller is consuming a higher percentage of the total power.
Is this all standard behaviour? Did I win silicon lottery? Have I discovered anything of value?