AMD Ryzen 7 8700G and Ryzen 5 8600G Review: Zen 4 APUs with RDNA3 Graphics
by Gavin Bonshor on January 29, 2024 9:00 AM EST- Posted in
- CPUs
- AMD
- APUs
- Phoenix
- 4nm
- Zen 4
- RDNA3
- AM5
- Ryzen 8000G
- Ryzen 7 8700G
- Ryzen 5 8600G
Core-to-Core Latency
As the core count of modern CPUs is growing, we are reaching a time when the time to access each core from a different core is no longer a constant. Even before the advent of heterogeneous SoC designs, processors built on large rings or meshes can have different latencies to access the nearest core compared to the furthest core. This rings true especially in multi-socket server environments.
But modern CPUs, even desktop and consumer CPUs, can have variable access latency to get to another core. For example, in the first generation Threadripper CPUs, we had four chips on the package, each with 8 threads, and each with a different core-to-core latency depending on if it was on-die or off-die. This gets more complex with products like Lakefield, which has two different communication buses depending on which core is talking to which.
If you are a regular reader of AnandTech’s CPU reviews, you will recognize our Core-to-Core latency test. It’s a great way to show exactly how groups of cores are laid out on the silicon. This is a custom in-house test, and we know there are competing tests out there, but we feel ours is the most accurate to how quick an access between two cores can happen.
Looking at core-to-core latencies of the AMD Ryzen 7 8700G, as this is a monolithic Phoenix die, we can see good inter-core latencies between each of the eight individual Zen 4 cores. Going within the core, we can see solid latencies of 7ns, while things inter-core range between 17 and 21ns, showing that the Ryzen 7 8700G uses a single core cluster of eight cores.
Similar to what we've seen on previous iterations of Zen 4 and Zen 3, albeit on processors with multiple core complex (CCXs) such as the Ryzen 9 7950 and Ryzen 9 5950X, inter-core latencies are strong and low. In contrast, the Ryzen 7 8700G and other Ryzen 8000G monolithic chips on a single die remove the complications and penalties of connecting through AMD's Infinity Fabric interconnect. The Ryzen 7 8700G uses TSMC's refined 4nm manufacturing process, exactly the same as the Ryzen 7040 mobile, which is coincidentally the exact same design as the 8700G, given that AMD has repurposed Phoenix for use on AMD's AM5 desktop platform.
The core-to-core latency performance is inherently strong on the Ryzen 7 8700G, with low inter-core latencies. As expected, latency degrades a little going across the entire complex, but certainly not within the range where we would expect these penalties to cause latency issues when cores have to communicate with each other.
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TheinsanegamerN - Wednesday, January 31, 2024 - link
If its being sold as a desktop chip it should be compared against the desktop chips it is competing against. If I am building a mini desktop with an APU the 7840u is irrelevant.meacupla - Wednesday, January 31, 2024 - link
Which, again, is hilarious.The facts point to 8700G and AM5 platform costing too much to make sense. If you want a cost effective gaming setup, you are better off with an i3 or R5 with dGPU.
8700G's one niche is ultra compact mITX without a dGPU. But if you go that route, it's now competing with.... oh look at that, the mini-PC segment.
maxijazz - Saturday, February 3, 2024 - link
Low power APUs as 7840, 8x00G are perfect for fanless (noiseless) mini desktops (audio servers) used in (so called) computer-audio industry, audio-hobby. Intel sucks in these applications recently.ermg_chips - Tuesday, January 30, 2024 - link
What I'm wondering is, are they going to come out with an 8700GE, 8600GE, etc eventually? The 5xxxGE series were the same CPUs but with a TDP set to 35W to fit in the same ultra-compact systems that the 35W intel -T chips do.I have a weird reason for caring, I live a nomadic/unstable lifestyle but still like to self-host all my shiz, so cramming as much compute into a "1 liter" PC as possible is important to me, and at my price point, I've been very happy with a 5750GE in a HP EliteDesk Mini stuffed with RAM as a teeny Proxmox box.
FWhitTrampoline - Monday, January 29, 2024 - link
It's just too bad that Intel did not release any 65W Meteor Lake S Socket Packaged variants As I would rather have built the Intel variant of the ASRock Desk Mini with Meteor Lake instead. And I have to LOL that the Tech Press can only Show the CPU only Blender 3D Cycles Rendering tests as there's no Radeon iGPU ROCm/HIP support for any Blender 3D iGPU accelerated Cycles Rendering testing.And Intel's Meteor Lake iGPUs have proper and working iGPU compute API support via Intel's OneAPI/Level-0 whereas on Linux AMD's ROCm/HIP GPU compute API support is just not there for Radeon iGPUs or for most Consumer Radeon dGPUs currently.
TheinsanegamerN - Tuesday, January 30, 2024 - link
It still wont fit in your in win chopin.FWhitTrampoline - Tuesday, January 30, 2024 - link
I do not own an Inwin Chopin but I do own an ASRock X300 Desk Mini and having to Blender Cycles render on the CPU cores and it's just too much for that OEM cooling solution to handle on the x300 sans any thermal throttling. But Because of the lack of Proper AMD ROCm/HIP support there for the Vega iGPU I can not make use of that for Blender 3D iGPU accelerated Cycles rending where there's plenty more FP units on the iGPU to accelerate the Ray Tracing calculations(Ray Tracing is a Compute Intensive workload).And I love how the Tech Press utilizes Blender 3D's CPU Cycles rendering as a CPU stress test and totally ignores any Blender 3D iGPU and dGPU Blender Cycles rendering tests to the point where that's basically ignored and an uncovered subject for the most part. But at least Intel cares more for creators there than AMD! Intel's got it's iGPUs support for Compute Workloads on Linux via OneAPI and Level-0 while AMD just lets the console makers to the hard part of tweaking AMD's APUs for Gaming Graphics workloads only!
But I'm going to have to wait for Arrow Lake to get any Socket Packaged Intel SKUs with the better Tile Based Graphics on a Desktop/Socket Packaged offering!
meacupla - Monday, January 29, 2024 - link
When you compare the 8700G results to 7840HS (Beelink GTR7), the performance difference is negligible.It seems to me that if you don't pair the 8700G with premium RAM, you would be further wasting your money.
t.s - Tuesday, January 30, 2024 - link
Seconded! With better power consumption too.AndrewJacksonZA - Monday, January 29, 2024 - link
Question: If a person has an APU, why use Blender CPU only?So on float8, there's a 2% difference between the 8700G and the i7-14900K. Wow.
Thank you