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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zodiacfml - Monday, January 29, 2024 - link
thanks but it would have been nicer for me with an i3-12100 in the charts. The 13100f or 12300f tests from old reviews not comparable.TheinsanegamerN - Tuesday, January 30, 2024 - link
Take 13100f and extrapolate. Not that hard.PeachNCream - Tuesday, January 30, 2024 - link
Not a bad CPU overall, though it does absolutely devour electrical energy. Competition is far worse, but that shouldn't justify a CPU alone consuming more power than would be required to provide illumination to an entire home - it's worth eleven 800 lumen lights! In the evenings or night, I usually have four or fewer bulbs active for half the power consumption or less than this CPU at sub-maximum workloads WITHOUT the rest of the supporting components a PC requires to provide useful functions. Perspective makes it obvious that's quite terrible when we live on a world that is overpopulated, polluted, and hanging on the precipice of being unable to sustain enough food production to feed us and we all know what happens when humans are hungry and forced to compete for limited resources.TheinsanegamerN - Tuesday, January 30, 2024 - link
If you're that scared of power use, buy a celeron mini PC and be quiet.PeachNCream - Tuesday, January 30, 2024 - link
Some of us have to care because it's obvious a lot of us don't and have our heads buried in the sand.TheinsanegamerN - Wednesday, January 31, 2024 - link
Why are you using a PC if you care? why are you not in a commune growing organic crops by hand if you care so much?Nobody cares about your virtue signaling.
PeachNCream - Wednesday, January 31, 2024 - link
Clearly you feel threatened enough by your own lifestyle choices to care by going on the attack and suggesting some extreme alternative like this commune nonsense as if suggesting it eliminates any slight adjustment to your own actions that could offer a reduction in the guilt you're coping with by lashing out.erotomania - Wednesday, January 31, 2024 - link
How exactly is a 65W processor with graphics "gobbling power"? If you mean inefficient, i suppose we could discuss, with facts. But these are modern Ryzen cores, with some mobile genetics - I don't think inefficient applies.In the past I had some Richland APUs (with FX cores) that were definitely inefficient but still idled as low an anything else. I have a 5600G system that idles so low my UPS can't detect it, event though when not idle the system is OC'ed. I would not characterize either as gobbling power.
PeachNCream - Thursday, February 1, 2024 - link
I've already somewhat pointed out why there the consumption is a considerable factor. ~87W at full load as indicated on AT's measurements is enough to provide illumination for an entire home. That isn't a comment on efficiency (or work accomplished for power expended) and I didn't indicate that in my initial post. It's an observation about the power cost implications and impacts of a PC when a single component consumes that much energy and it still, as a standalone device, is an incomplete representation of overall power consumption of a PC built around it.And, it's fair to point out that it is NOT an Intel CPU with far higher consumption. I also mentioned that as well in the same post. AMD's CPUs demonstrate a better work-to-wattage ratio so please realize that I'm aware that among all desktop CPUs, this particular chip is far from the worst possible option.
maxijazz - Saturday, February 3, 2024 - link
Maybe people feel threatened because proud woke people (aka communists-fascists) want to enforce their lifestyle on others? By lobbied out new laws, by propaganda, by censorship.Otherwise nobody would feel threatened.
Live your life and let others live theirs.
If you like force others for good of society, world or universe, go to North Korea. They have communism as state's religion.