Originally posted by cb88
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AMD Announces Ryzen 7 5800X3D Shipping On 4/20, New Mainstream CPUs
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Originally posted by F.Ultra View Post
Well it could be an idea if the E-cores where really really efficient, like say some really low powered 500Mhz ARM cores or something that could handle routine OS background tasks.
You'll find that per work done a 500Mhz arm core running constantly is worse than a fast x86 core sprinting to idle... due to that factor.
The main reason companies end up doing 2 core sizes is to boost specs and save silicon and because thier CPU doesn't have power gating like AMDs CPUS do.
Note I am not contesting the point that you can build very low power CPUs... just pointing out that their perf/W is often worse than you'd expect... and when fully powered up you kind of have to count that part of the die as dead weight...Last edited by cb88; 16 March 2022, 01:21 PM.
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Originally posted by cb88 View Post
That's kind of the problem... for those you are better off having a fast core periodically run, if you are running such tasks periodically that also means you can put the entire system in low power state and not just the CPU and power them back up to run the task in question.
You'll find that per work done a 500Mhz arm core running constantly is worse than a fast x86 core sprinting to idle... due to that factor.
The main reason companies end up doing 2 core sizes is to boost specs and save silicon and because thier CPU doesn't have power gating like AMDs CPUS do.
Note I am not contesting the point that you can build very low power CPUs... just pointing out that their perf/W is often worse than you'd expect... and when fully powered up you kind of have to count that part of the die as dead weight...
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From what I heard heard elsewhere, there may be a small error on the processor table. The R5 5500 should be a 6nm Cezanne die, and listed as Zen3+. That also explains why it has less cache and only supports PCIe 3.0
Originally posted by Venemo View PostWhy isn't there a 5900X3D or a 5950X3D?
I guess the 5800X3D is released for two reasons. One is that they said they would, and they value people believing their statements. Another is they want to take the 'gaming crown' for a bit before Zen 4 is available.
Edit: The R7 5700X should be a nice part. Gamers Nexus benchmarked an R7 5800, an OEM only part which may be the same thing, and found it very close to 5800X performance while honouring the 65W TDP.Last edited by Teggs; 16 March 2022, 06:34 PM.
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Originally posted by rclark View PostI was hoping for low end 4 core zen 3 processors with the graphics built in for file server builds where a stand-a-lone graphics card isn't necessary but still needed for bios updating and such. Like the 2400G .... at a $100 max price point.
You could instead buy a board that has a BMC chip, but those are very expensive and typical BMC performance is horrendously bad, if you actually need to do a significant amount of GUI stuff, locally. I have an ASRock Rack board with an ASpeed 2500. Let me tell you: "speed" doesn't belong anywhere in the name.
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Originally posted by Venemo View PostWhy isn't there a 5900X3D or a 5950X3D?
Probably, the 3D stacking hurts peak clock speeds. Also, we know that having more cache is mostly a benefit if it's local to the die. If you have to go through the I/O die to reach L3 cache on another chiplet, then the advantage isn't as big.
So, a single-chiplet CPU is where they get the greatest benefit from it.
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Originally posted by schmidtbag View PostExcept as you already said, more cores in less silicon. That means more cores at a lower cost.
It's not easy to see the latter, because the damn P-cores boost so high. However, if they'd replaced those two quad-Gracemont clusters with two more Golden Cove P-cores, I'm sure the net result would be not only worse perf, but also worse perf/W.
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Originally posted by Jabberwocky View PostI'm seriously considering getting a 5800X with stepping B2.
Originally posted by Jabberwocky View PostThis is an interesting take on getting Nvidia to go open source
Originally posted by Jabberwocky View PostEdit: I just heard that you can't overclock the 5800X3D... wondering what that's aboutLast edited by coder; 17 March 2022, 05:50 AM.
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Originally posted by cb88 View Postfor those you are better off having a fast core periodically run, if you are running such tasks periodically that also means you can put the entire system in low power state and not just the CPU and power them back up to run the task in question.
Originally posted by cb88 View PostYou'll find that per work done a 500Mhz arm core running constantly is worse than a fast x86 core sprinting to idle... due to that factor.
A single E-core is using only 15 W total CPU package power vs. 78 W for the P core. And yet, the E-core is still about half as fast as the P-core.
Source: https://www.anandtech.com/show/17047...d-complexity/4
Originally posted by cb88 View Postwhen fully powered up you kind of have to count that part of the die as dead weight...
Now, let's see how mobile cores compare:
Source: https://www.anandtech.com/show/16983...re-efficient/2
So, the Apple's A15 P-cores take 9.3x the power to deliver 3.0x the performance. In terms of energy-consumed, the P-core needed 3.1x to do the same work as the E-core. That's shows "sprint to idle" is definitely not a winning strategy.
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