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AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

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Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#61

Post by CharlesW »

alyandon wrote: post #21
Scandiravian wrote: post #8

I wish they'd included the results of the undervolted 7950x in the graphs (aka ECO mode) It's sad that performance benchmarks have made market conditions where the gain of 5% performance is somehow worth 20%-30% extra power consumption (and the noise that follows from that)

I just disable PBO on my 3900X - you are 100% correct that an extra 5% performance is not worth the extra 30% power draw/heat.

For anyone else not familiar with "PBO", it's AMD's "Precision Boost Overdrive", which is apparently completely different than Precision Boost and Precision Boost 2: https://www.gamersnexus.net/guides/3491-explaining-precision...

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#63

Post by varispeed »

Have you noticed how AMD and Intel just do tiny steps, sometimes even not worth writing about when it comes to innovation? It's always either AMD matching the new Intel CPU of other way around - it's never about eg. completely crushing Intel.

This is the problem of late stage capitalism, where both companies are owned by the same large investment funds and they use their power to ensure neither company could eat too much profits of another.

When AMD was falling behind, they seem to have been "allowed" to do the Ryzen and it's back again to "elephant race".

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#64

Post by ChuckNorris89 »

mabbo wrote: post #37
Ekaros wrote: post #18

The inflation has really hit the consumer market... 700$ for CPU and over thousand for GPU... Memory is not cheap either... Not that it won't sell, but still these price points for something still called consumer start to be high. You could get a whole portable PC for same money.

Is it? Have a look at this article from 2002: > With the cuts, the wholesale cost of a 733-MHz Pentium III drops 3 percent, from $776 to $754, while the 700-MHz version drops 3 percent from $754 to $733 in volume. https://www.cnet.com/culture/intel-cuts-pentium-iii-prices-1... $754 in today's dollars is over $1250. Cutting edge processors are cheaper than they were 20 years ago.

Indeed. People forget that flagship Intel Extreme Edition or AMD Athlon FX chips from ~17 years ago were retailing for over 1000$ in the money of that time. In today's roubles they would be around 1500$ adjusted for inflation. Ouch!

Today 750$ for a flagship CPU that buys you the best possible compute in the consumer space is not a bad deal at all. It's never been a better time for X86 CPU shopping. You most likely don't need to buy the most expensive flagship CPU. There's great options for every budget.

The GPU market on the other hand is completely fucked. In 2007 you could get a 8800 GTS for 360$ (520$ today) giving you near flagship performance.

I feel like AMD and Intel are competing in the CPU space while AMD and Nvidia entered in a gentlemen's agreement to control the GPU market.

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#65

Post by pizza234 »

brundolf wrote: post #59

Silly question: what constrains cache sizes? What prevents just making them bigger and bigger?

AFAIK, power and speed. There's an interesting paper on this topic: [Cache Design Trade-offs for Power and Performance Optimization: A Case Study](http://iacoma.cs.uiuc.edu/CS497/LP5a.pdf).

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#66

Post by pyrolistical »

brundolf wrote: post #59

Silly question: what constrains cache sizes? What prevents just making them bigger and bigger?

Distance (hence latency) to compute cores? This is why stacking works. The z distance wasn’t previously utilized

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#67

Post by goosedragons »

likeclockwork wrote: post #56
shock-value wrote: post #38

Earlier quoted context omitted.

[flagged]

What driver is responsible for assigning specific games to specific CPU CCDs? Is this a real thing? Is it available on Linux? Or am I sticking with Intel?

It's the CPU scheduler. You can easily avoid this by just not buying an X3D variant. Recent Intel CPUs can have the same problem where processes get assigned to the efficiency cores instead of performance cores if the right scheduler isn't used (like by using Windows 10 or an old Linux distro without explicit support)

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#68

Post by HelixEndeavor »

drewg123 wrote: post #45
perihelions wrote: post #33

AnandTech sees some intriguing regressions on certain benchmarks, https://www.anandtech.com/show/18747/the-amd-ryzen-9-7950x3d... ( "CPU Benchmark Performance: Simulation" ) Worst is Factorio, which is down -47% against the 5800X3D (a previous-generation CPU that also uses stacked L3 cache), on the benchmark "10K trains". Wonder what's going on there? - "We would have expected higher performance in our Factorio bench…

When they manually forced it onto the CCD with 3D-Vcache, they saw a 100% speedup: " As we can see in our Factorio benchmark, we saw massive gains of over 100% when forcing the Ryzen 9 7950X3D to use the CCD with the 3D V-Cache as opposed to letting AMD's PPM Provisioning and 3D V-Cache Optimizer drivers do their thing automatically. "

So presumably a bug that can be fixed by either AMD updating their optimizer, Factorio updating to work better with it, or both?

Re: AMD releases a new flagship CPU for consumer market with 128M of L3 Cache

#69

Post by likeclockwork »

goosedragons wrote: post #67
likeclockwork wrote: post #56

Earlier quoted context omitted.

What driver is responsible for assigning specific games to specific CPU CCDs? Is this a real thing? Is it available on Linux? Or am I sticking with Intel?

It's the CPU scheduler. You can easily avoid this by just not buying an X3D variant. Recent Intel CPUs can have the same problem where processes get assigned to the efficiency cores instead of performance cores if the right scheduler isn't used (like by using Windows 10 or an old Linux distro without explicit support)

And there's actually a list of blessed processes in the scheduler?!
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