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T
Tuna-Fish
replied to the thread
Discussion
RDNA4 + CDNA3 Architectures Thread
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I wouldn't be willing to quote any actual speed, but yes, it's common for ES chips of all varieties to be clocked arbitrarily low...
Aug 26, 2024
T
Tuna-Fish
replied to the thread
Discussion
Zen 5 Architecture & Technical discussion
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It's a hand-optimized loop, it doesn't look like a benchmark that gives any kind of comparable results between different architectures...
Aug 23, 2024
T
Tuna-Fish
replied to the thread
Discussion
RDNA4 + CDNA3 Architectures Thread
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... They are not launching it into the 7000 series.
Aug 23, 2024
T
Tuna-Fish
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Bigos's post
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Discussion
Zen 5 Architecture & Technical discussion
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Yeah, it sounds like they did all of the work to make it possible to use both in a single thread (why else mention them being able to...
Aug 22, 2024
T
Tuna-Fish
replied to the thread
Discussion
Zen 5 Speculation (EPYC Turin and Strix Point/Granite Ridge - Ryzen 9000)
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Yes. This helps less against spilling due to register pressure, where latency is usually out of the critical path, as the spilled value...
Aug 22, 2024
T
Tuna-Fish
replied to the thread
Discussion
Zen 5 Architecture & Technical discussion
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Zen5 is exploring entirely new thresholds of being front-end bound. "all" that Zen6 needs to do to be a much better core is to have a...
Aug 20, 2024
T
Tuna-Fish
replied to the thread
Question
Zen 6 Speculation Thread
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AMD's 90nm SOI node was significantly better than Intel's 90nm bulk. Intel started having serious scaling issues because of quantum...
Aug 20, 2024
T
Tuna-Fish
replied to the thread
Discussion
Zen 5 Architecture & Technical discussion
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The effect is completely negligible in that use. It matters for high-throughput web servers and such, as it reduces the overhead of...
Aug 19, 2024
T
Tuna-Fish
replied to the thread
Discussion
Zen 5 Speculation (EPYC Turin and Strix Point/Granite Ridge - Ryzen 9000)
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Not "extra memory" but more efficient paging. Normally, all memory on x86 windows is accessed through 4kB pages. If you want to access...
Aug 18, 2024
T
Tuna-Fish
replied to the thread
Question
Zen 6 Speculation Thread
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Nope, there are plenty of in-order CPUs that have branch predictors. The reason you need a predictor is that modern CPUs are deeply...
Aug 15, 2024
T
Tuna-Fish
replied to the thread
Discussion
Zen 5 Speculation (EPYC Turin and Strix Point/Granite Ridge - Ryzen 9000)
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Linux has been used a lot in large NUMA systems and has had a lot of work done to support it, and because of this has the best NUMA...
Aug 14, 2024
T
Tuna-Fish
replied to the thread
Discussion
Zen 5 Speculation (EPYC Turin and Strix Point/Granite Ridge - Ryzen 9000)
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This is horrifying. It easily explains the regressions.
Aug 14, 2024
T
Tuna-Fish
replied to the thread
Question
Zen 6 Speculation Thread
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Superscalar means "can execute more than one operation at the same time", and OoO means "can execute operations out of strict program...
Aug 14, 2024
T
Tuna-Fish
replied to the thread
Question
Zen 6 Speculation Thread
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SMT increases power consumption linearly with increasing performance. Raising clocks raises power consumption to the second or third...
Aug 13, 2024
T
Tuna-Fish
replied to the thread
Discussion
Zen 5 Architecture & Technical discussion
.
The µop cache has fixed-lenght lines, with 6 ops per line, so 1024 lines. There are alignment restrictions, iirc every x86 instruction...
Aug 11, 2024
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