Thanks to
thankyou I have a Cezanne APU to test a bit on a budget board.
Setup:
MB: MSI B550M A-PRO (Bios 2.40) [attached some small aluminum heatsinks to mosfets]
APU: AMD R7 5700G
RAM: 2x8GB 3733 22-23-23-55 HP37D4U1S8ME (weird HyperX Fury kit made for HP) (XMP 1) / changed to a average B-Die Kit later on
M.2: MP510 480GB
GPU: RTX 3080Ti / removed at later part for iGPU testing
PSU: AX850
Cooling: Custom Loop (1x 360mm slim rad) / changed to Sythe Fuma 2 after removing GPU
OS: Win 10 21H1 using windows balanced power plan
latest AMD drivers as of June 17th, 2021
CB R20 MC | Package Power | Temp CPU | Temp Mosfet | Average Score | Points Per Watt |
| 95W | 77°C | 70°C | 5505 | 57.95 |
| 88W (Stock) | 75°C | 68.5°C | 5365 | 60.97 |
| 57W | 58°C | 56°C | 4824 | 84.63 |
| 40W | 50°C | 50.5°C | 4240 | 106 |
| 96W (1.275V load, 1.3V Bios LLC4) 4.5GhZ all core | 76.5°C | 70.5°C | 5842 | 60.85 |
CB R20 MC/SC Scores [incl. mild boost clock override. (4.725GHz single core boost) 95W Package Power]CB R20 MC/SC Scores [incl. CO (-11,-6,-11,-12,-13,-11,-11,-10)] (based on above settings)
Aida64: (changed to 4000 1:1:1 16-17-17-34 B-Dies) (can boot up to 4200 in sync but the required vSoC is getting to high for my tastes)
| Read | Write | Copy | Latency |
| ~61.2k | ~61k | ~55.5k | ~50ns |
Furthermore the CB20 scores also improved by... ~1%

not gonna bother putting that down here.
Quick Gaming Benchmark:SoTR CPU Game/Render 1080p Highest| Min | Max | Average | 95% |
| 131/163 | 252/419 | 187/247 | 135/182 |
~15% slower than a 5800x with similar optimization.
iGPU time now (switched to a more realistic 3600 1:1:1 16-17-17-34 GDM enabled which should be easily possible for anyone with b-dies and a little time)
SoTR 3600 16-17-17-34
SoTR 2400 JEDEC

Conclusions:
Firstly I'd like to point out that this board despite being low in spec handles the top end Cezanne pretty good.
There are overclocking limitations such as on the IF part or even on the APU itself but this hardly matters for regular users.
If the connectivity is sufficient, this board will do just fine for any Cezanne APU.
Cezanne is a bit of a mixed bag. I have just pushed until IF 2100 1:1:1 and stopped there as the vSoC requirements were too high for what I'd consider a daily driver.
Even at this point it can't compete with the 5800X when it comes to gaming. The cache cut half is just too much. You'll end up looking at ~15% performance loss with similar system configurations whenever being CPU limited.
However this is also promising news with a Zen3 refresh with added cache around the corner.
Cezanne behaves a little different to Vermeer. It boosts roughly 150-250MHz lower in different load states and sticks to a single core for single core loads rather than cycling between two cores like Vermeer is doing. Latency didn't drop just as much as it did using Renoir over Zen2, I guess that's down to AMD optimizing Zen3 quite a bit there.
So should you consider a 5700G at ($359 USD) over a 5800X ($449 USD) or a 5600G ($259 USD) over a 5600X ($299 USD)? If you use a GPU I'd rather stick to their 5600X/5800X despite the top up in price. Alternatives would be Rocket Lake CPU's obviously such as the 11400F instead of the 5600X or 11700 instead of the 5800X. Hopefully prices on the Vermeer's will come down slightly with the Cezanne launch anyways.
But lets come to where Cezanne really shines. Power draw. This is the
perfect APU for a GPU less system for casual 1080p low graphics gaming and regular workloads. It doesn't lose much efficiency going down to
57W package power. This 57W is also where this APU matches a 3700x (at a fraction of the power draw!) which should also be reasonably close in pricing upon launch. So imagine 3700x performance in a small system which is barely audible. Enough to get your work down and for some casual gaming with sacrifices on resolution and graphics.
I just reran the CPU at 55W package power, air cooling (Fuma 2) with the Curve Optimizer + Boost clock override settings above. CB R20 MC score is stable ~@4940 points over 10 runs. And the system is hardly audible on a silent fan profile running at roughly 30K above ambient.

It'll also be easily possible to run this chip using a PicoPSU after limiting power draws.
Take a look at the total system (excluding monitor) power draw of the above system (AX850) in idle.

That's 13.2W for Mainboard, APU, RAM, Peripherals, 2 Fans, active iGPU with connected 1080p monitor ... with a PSU that will have quite some switching losses at this load. Take a PicoPSU and you'll be at ~10W. Possibly just below. Your Vermeer CPU can't even power its IO Die with that...
At this point I'd like to give a thanks to [thankyou] yet again for letting me test his 5700G. I'll probably be buying the 6 core myself if it is priced close to the USD msrp. Cheers.
This post has been edited by nrw: Jun 19 2021, 08:06 PM