[Tom's Hardware] AMD EPYC Rome Benched: 64 Cores, 128 Threads Boosting to 2.2 GHz (for now) - Page 3 - Overclock.net - An Overclocking Community

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[Tom's Hardware] AMD EPYC Rome Benched: 64 Cores, 128 Threads Boosting to 2.2 GHz (for now)

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post #21 of 31 (permalink) Old 04-07-2019, 08:03 AM
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Quote: Originally Posted by KyadCK View Post
What I half expect with this 256MB L3 is that half of it will reside on the IO die as a mirror of what is on the CPU so that the chips no longer need 2 hops and to interrupt another core to access another die's L3. Also eventual HBM stacking on the IO die, per previous AMD slides.
That sounds like a great way to improve latency, but also like a hardware security flaw waiting to happen. Any chiplet having access to all other chiplets L3, and ram on a server.

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post #22 of 31 (permalink) Old 05-19-2019, 11:27 AM
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EPYC Rome 32c VS EPYC 7551 in SiSoftware Processor Multi-Media
Benchmark, How they managed to boost IPC >50%?
Scary if it's true.
https://www.tomshardware.com/news/am...ecs,39373.html
https://ranker.sisoftware.co.uk/show...187f4c9f9&l=en
https://ranker.sisoftware.co.uk/show...385f6cbf3&l=en
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post #23 of 31 (permalink) Old 05-19-2019, 11:50 AM
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Quote: Originally Posted by mothergoose729 View Post
Put another way, two EPYC 32 core CPUs are 30% faster than a single one of these 64 cores CPU, assuming linear scaling with clock speed.
I would say that is expected considering power and heat constraints.

While it might be slower, it doesn't matter when you have a system that needs 128/256 cores.


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post #24 of 31 (permalink) Old 05-20-2019, 05:32 AM
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Quote: Originally Posted by Hwgeek View Post
EPYC Rome 32c VS EPYC 7551 in SiSoftware Processor Multi-Media
Benchmark, How they managed to boost IPC >50%?
Scary if it's true.
https://www.tomshardware.com/news/am...ecs,39373.html
https://ranker.sisoftware.co.uk/show...187f4c9f9&l=en
https://ranker.sisoftware.co.uk/show...385f6cbf3&l=en
Performance doesn't scale linearly. So having a lower clock might show a better IPC than it can achieve at higher clocks.
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post #25 of 31 (permalink) Old 05-20-2019, 07:34 AM
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Quote: Originally Posted by NightAntilli View Post
Performance doesn't scale linearly. So having a lower clock might show a better IPC than it can achieve at higher clocks.
That is untrue. Performance alone (IPC x clock speed) is linear. If everything on a CPU is scaled up 40%, it will be 40% faster in everything. Performance per watt is not linear, as both speed (linear) and voltage (linear) are multiplied for final wattage and combined with power gating may result in less performance than reported clock speed would otherwise say. There may also be bottlenecks in, say, RAM controllers or otherwise that limit a core's ability to work, but that is not the same as the CPU not scaling; the Core's performance (IPC) is irrelevant of external factors.

In this case you can not use clock speed as your only metric anyway as they are two very different designs. It may still run on Zen cores, but the CPUs overall layout is vastly changed from the first iteration, to the point that you may as well be comparing it to an IBM chip. For a start we know there is more FPU logic on the die (2x if I'm remembering right) than previous Ryzen designs, which would obviously make a significant impact all on it's own.

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post #26 of 31 (permalink) Old 05-20-2019, 08:46 AM
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Quote: Originally Posted by KyadCK View Post
That is untrue. Performance alone (IPC x clock speed) is linear. If everything on a CPU is scaled up 40%, it will be 40% faster in everything. Performance per watt is not linear, as both speed (linear) and voltage (linear) are multiplied for final wattage and combined with power gating may result in less performance than reported clock speed would otherwise say. There may also be bottlenecks in, say, RAM controllers or otherwise that limit a core's ability to work, but that is not the same as the CPU not scaling; the Core's performance (IPC) is irrelevant of external factors.

In this case you can not use clock speed as your only metric anyway as they are two very different designs. It may still run on Zen cores, but the CPUs overall layout is vastly changed from the first iteration, to the point that you may as well be comparing it to an IBM chip. For a start we know there is more FPU logic on the die (2x if I'm remembering right) than previous Ryzen designs, which would obviously make a significant impact all on it's own.
Pretty sure that's not the formula for wattage...


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post #27 of 31 (permalink) Old 05-20-2019, 09:36 AM
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Quote: Originally Posted by mmonnin View Post
Pretty sure that's not the formula for wattage...
he forgot amps.


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post #28 of 31 (permalink) Old 05-20-2019, 11:03 AM
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Quote: Originally Posted by KyadCK View Post
That is untrue. Performance alone (IPC x clock speed) is linear. If everything on a CPU is scaled up 40%, it will be 40% faster in everything.
years ago I recall reading the stilt talk about steamroller in Kaveri CPUs having a performance wall around 4.6Ghz. higher clockspeeds did not increase performance linearly, or even much at all. perhaps it is a rare case.
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post #29 of 31 (permalink) Old 05-20-2019, 11:23 AM
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Quote: Originally Posted by mmonnin View Post
Pretty sure that's not the formula for wattage...
Speed is linear increase, voltage is exponential increase, and capacitance is mostly flat overall.
P = a * C * V2 * f


P is power (Watts). V is voltage (Volts). f is the frequency (cycles/sec), or equivalently, the number of seconds/cycle. And C is capacitance (Farads). A Farad is Coulombs/Volt, the charge divided by the EMF (Electromotive Force) potential.
https://software.intel.com/en-us/blo...obvious-pt-2-2


Last edited by EniGma1987; 05-20-2019 at 11:35 AM.
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post #30 of 31 (permalink) Old 05-20-2019, 05:47 PM
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Quote: Originally Posted by KyadCK View Post
That is untrue. Performance alone (IPC x clock speed) is linear. If everything on a CPU is scaled up 40%, it will be 40% faster in everything. Performance per watt is not linear, as both speed (linear) and voltage (linear) are multiplied for final wattage and combined with power gating may result in less performance than reported clock speed would otherwise say. There may also be bottlenecks in, say, RAM controllers or otherwise that limit a core's ability to work, but that is not the same as the CPU not scaling; the Core's performance (IPC) is irrelevant of external factors.

In this case you can not use clock speed as your only metric anyway as they are two very different designs. It may still run on Zen cores, but the CPUs overall layout is vastly changed from the first iteration, to the point that you may as well be comparing it to an IBM chip. For a start we know there is more FPU logic on the die (2x if I'm remembering right) than previous Ryzen designs, which would obviously make a significant impact all on it's own.
At bold part... Provided RAM is not a bottleneck, which we know influences Ryzen heavily, because it influences how infinity fabric works.

Last edited by NightAntilli; 05-20-2019 at 05:55 PM.
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