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Intel’s High-End Cascade Lake CPUs to Support 3.84 TB of Memory per Socket

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31–40 of 95 posts

Re: Intel’s High-End Cascade Lake CPUs to Support 3.84 TB of Memory per Socket

#31

I've weighed up the pros and cons, and my next processor will be the 32 core AMD cpu. This seems much better value than anything Intel has to offer.

It depends on your workload. If you are using all these cores (ex: compiling) then that's probably the best option.

If you are gaming however, 32 core is mostly useless and you should probably go with single thread performance. Intel i5 are still the CPUs of choice for gamers, though AMD Ryzen 5 are not bad either.

Re: Intel’s High-End Cascade Lake CPUs to Support 3.84 TB of Memory per Socket

#32

Earlier quoted context omitted.

Case in point: > chips will support up to 3.84 TB of memory per socket ... due to combining 512 GB Optane DIMMs and 128GB DDR4 DIMMs > ... > in a 6 x Optane and 6 x DDR4 configuration, they will provide 3072 GB of 3D XPoint memory and 768 GB of DDR4 RAM for a total of 3.84 TB of memory Optane DIMMs don't really have the performance characteristics of traditional DRAM. It sounds like the real capacity per socket is 12…

But what market are they even trying to hit here? DDR4 prices are insane, but home consumers don't run large NUMA systems. Data center admins are going to be able to get the capitol for real DDR4 over Optane. They'd need to be ordering a lot of servers before the price point becomes significant enough that they'd order an Optane configuration and decide to benchmark them. I'd be curious about the real benchmarking at…

The idea of putting ssds in memory dimms isn't new, the jedec standard for this is included in ddr3. It's referred to as an nvdimm(-f for SSD), sandisk and IBM both produced and sold them. These are supported since Linux kernel 4.1 and show up as a block device in /dev/pmem. The latest optane variants are nvdimm-p and are not treated like block storage devices but instead as persistent memory to the OS.

The storage dimms have some notable benefits over pcie nvme ssds - latency to the processor is extremely low, they give extra total storage I/O since they're leveraging a different controller on the cpu with its own bandwidth, while still leaving pcie bandwidth for traditional storage. They can add capacity to a small system (a 1U server can hold 24 such ssds)

As I see it though, these optane dimms are just fast swap drives which do not offer the same consistent throughput as true memory dimms. They are transparent to the OS which is normally in charge of deciding what stays in memory and what goes to swap. Use of an Intel sdk is required to leverage much of the benefits. It's also Intel-only as far as support goes for now. As usual the marketing doesn't mention the throughput or pricing and instead of comparing to memory they compare it to storage.

http://www.admin-magazine.com/HPC/Articles/NVDIMM-Persistent...

https://thessdguy.com/an-nvdimm-primer-part-1-of-2/

https://www.extremetech.com/extreme/270270-intel-announces-n...

Re: Intel’s High-End Cascade Lake CPUs to Support 3.84 TB of Memory per Socket

#33

Earlier quoted context omitted.

They probably felt pressured to release that because the next gen thread rippers are actually going to approach those specs: 32 core 3.8 (base) GHz as per https://www.techradar.com/news/amd-ryzen-threadripper-2nd-ge... supposedly coming out in Q3, i.e. soon

Threadripper may come close in core count, but it cannot use registered memory, which means it's limited to 128 GB of RAM (based on the current maximum UDIMM capacities). That's not competitive in the server space.

EYPC is their server line, which has a 32 core count cpu with RDIMM support.

Re: Intel’s High-End Cascade Lake CPUs to Support 3.84 TB of Memory per Socket

#34

Earlier quoted context omitted.

But what market are they even trying to hit here? DDR4 prices are insane, but home consumers don't run large NUMA systems. Data center admins are going to be able to get the capitol for real DDR4 over Optane. They'd need to be ordering a lot of servers before the price point becomes significant enough that they'd order an Optane configuration and decide to benchmark them. I'd be curious about the real benchmarking at…

I thought the real advantage of Optane was bypassing the pcie bus, with much larger bandwidth of dimm: 80GB/s instead of 12GB/s

DDR4 dimm read throughput is about 20GB/s per dimm. PCIe 3.1 x4 is 16GB/s. I feel very comfortable claiming that these optane dimms will not reach 20GB/s of sustained performance.

The advantage here being latency (and thus single queue throughput)

Re: Intel’s High-End Cascade Lake CPUs to Support 3.84 TB of Memory per Socket

#35

I've weighed up the pros and cons, and my next processor will be the 32 core AMD cpu. This seems much better value than anything Intel has to offer.

It's a beast! I'm not sure if I'd give up single-thread speed, but if you can load those cores, it's an incredible offer.

I'd love to see more popular processors with high core count, even if at the cost of single thread performance. When even a phone CPU has 8 cores, being able to use the parallelism on the stuff we normally don't use it would improve life for everyone.

And, with high core counts, we can start playing with things like dedicating cores (and their L1 caches) to single tasks, kind of specializing them as we do with mainframes.

Re: Intel’s High-End Cascade Lake CPUs to Support 3.84 TB of Memory per Socket

#36

A few months ago Intel pulled a stunt where they showed a 28 core 5GHz CPU, implying it was a production CPU that would ship this year. They failed to mention that it was attached to an industrial compressor to supply the necessary cooling for the overclocked CPU, and that it was a server socket ( https://www.anandtech.com/show/12932/intel-confirms-some-det... ). Since then, whenever I see a headline with Intel in it…

Because AMD came out with innovation with their incredible Threadripper while Intel was going to keep dishing out about 10% faster cpus per year and maximize profits.

They have gotten greedy and lazy without any competition.

Re: Intel’s High-End Cascade Lake CPUs to Support 3.84 TB of Memory per Socket

#37

Earlier quoted context omitted.

They probably felt pressured to release that because the next gen thread rippers are actually going to approach those specs: 32 core 3.8 (base) GHz as per https://www.techradar.com/news/amd-ryzen-threadripper-2nd-ge... supposedly coming out in Q3, i.e. soon

Threadripper may come close in core count, but it cannot use registered memory, which means it's limited to 128 GB of RAM (based on the current maximum UDIMM capacities). That's not competitive in the server space.

Why does threadripper need to be competitive in the server space?

Edit: emphasis on threadripper, which is a consumer product.

Re: Intel’s High-End Cascade Lake CPUs to Support 3.84 TB of Memory per Socket

#38

Earlier quoted context omitted.

They probably felt pressured to release that because the next gen thread rippers are actually going to approach those specs: 32 core 3.8 (base) GHz as per https://www.techradar.com/news/amd-ryzen-threadripper-2nd-ge... supposedly coming out in Q3, i.e. soon

Threadripper may come close in core count, but it cannot use registered memory, which means it's limited to 128 GB of RAM (based on the current maximum UDIMM capacities). That's not competitive in the server space.

EPYC supports up to 2TB per CPU so it's not entirely uncompetitive... Not sure I trust Intel's figures here anyway - some people are saying it's less than the 3.84TB per socket...

https://www.tweaktown.com/news/58052/amd-epyc-32c-64t-3-2ghz...

Re: Intel’s High-End Cascade Lake CPUs to Support 3.84 TB of Memory per Socket

#39

A few months ago Intel pulled a stunt where they showed a 28 core 5GHz CPU, implying it was a production CPU that would ship this year. They failed to mention that it was attached to an industrial compressor to supply the necessary cooling for the overclocked CPU, and that it was a server socket ( https://www.anandtech.com/show/12932/intel-confirms-some-det... ). Since then, whenever I see a headline with Intel in it…

that damaged your trust? That seems totally fine to me, if you need 28 cores at 5Ghz you can have it. get a server board and cool it.

Years before that they were interfering with compilers and cheating at benchmarks to screw over AMD which was actual, willful, evil deception, but THIS damaged your trust?

Re: Intel’s High-End Cascade Lake CPUs to Support 3.84 TB of Memory per Socket

#40
post #5

Earlier quoted context omitted.

Case in point: > chips will support up to 3.84 TB of memory per socket ... due to combining 512 GB Optane DIMMs and 128GB DDR4 DIMMs > ... > in a 6 x Optane and 6 x DDR4 configuration, they will provide 3072 GB of 3D XPoint memory and 768 GB of DDR4 RAM for a total of 3.84 TB of memory Optane DIMMs don't really have the performance characteristics of traditional DRAM. It sounds like the real capacity per socket is 12…

Yeah, marketing lies. Go AMD go!

AMD is guilty of it as well. "AVX2" -> not really! But yes I do wish them well. Make the avx support real AMD!
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