Intel 3rd Gen Xeon Scalable (Ice Lake SP) Review: Generationally Big, Competitively Smallby Andrei Frumusanu on April 6, 2021 11:00 AM EST
- Posted in
- Xeon Scalable
- Ice Lake-SP
Section by Ian Cutress
Ice Lake Xeon Processor List
Intel is introducing around 40 new processors across the Xeon Platinum (8300 series), Xeon Gold (6300 and 5300 series) and Xeon Silver (4300 series). Xeon Bronze no longer exists with Ice Lake. Much like the previous generation, the 8/6/5/4 segmentation signifies the series, and the 3 indicates the generation. Beyond that the two digits are somewhat meaningless as before.
That being said, there is a significant change. In the past, Platinum/Gold/Silver also indicated socket support, with Platinum supporting up to 8P configurations. This time around, as Ice Lake does not support 8P, all the processors will support only up to 2P, with a few select models being uniprocessor only. This makes the Platinum/Gold/Silver segmentation arbitrary, if only to indicate what sort of performance/price bracket the processors are in.
On top of this, Intel is adding in more suffixes to the equation. If you work with Xeon Scalable processors day in and day out, there is now a need to differentiate the Q processor from a P processor, and an S processor from an M processor. There’s a handy list down below.
The easiest way with this is to jump into the deep end with the processor list. RCP stands for recommended customer price, and SGX GB stands for how large Software Guard Extension enclaves can be – either 8 GB, 64 GB, or 512 GB. Cells highlighted in green show highlights in the stack.
|Intel 3rd Gen Xeon Scalable
Ice Lake Xeon Only
|Xeon Platinum (8x DDR4-3200)|
|Xeon Gold 6300 (8x DDR4-3200)|
|Xeon Gold 5300 (8x DDR4-2933)|
|Xeon Silver (8x DDR4-2666)|
|Q = Liquid Cooled SKU
Y = Supports Intel SST-PP 2.0
P = IaaS Cloud Specialised Processor
V = SaaS Cloud Specialised Processor
N = Networking/NFV Optimized
M = Media Processing Optimized
T = Long-Life and Extended Thermal Support
U = Uniprocessor (1P Only)
S = 512 GB SGX Enclave per CPU Guaranteed (...but not all 512 GB are labelled S)
The peak turbo on these processors is 3.7 GHz, which is much lower than what we saw with the previous generation. Despite this, Intel seems to be keeping prices reasonable, and enabling Optane support through most of the stack except for the Silver processors (which has its own single exception).
New suffixes include Q, for a liquid cooled processor model with higher all-core frequencies at 270 W, and Intel said this part came about based on customer demand. The T processors are extended life / extended thermal support, which usually means -40ºC to 125ºC support – useful when working at the poles or in other extreme conditions. M/N/P/V specialized processors, according to our chat with Lisa Spelman, GM of the Xeon and Memory Group, are the focal points for software stack optimizations. Users that want focused hardware that can get 2-10%+ more performance on their specific workload can get these processors for which the software will be specifically tuned. Lisa stated that while all processors will receive uplifts, the segmented parts are the ones those uplifts will be targeted for. This means managing turbo vs use case and adapting code for that, which can only really be optimized for a known turbo profile.
It’s hard not to notice that the server market over the last couple of years has become more competitive. Not only is Intel competing with its own high market share, but x86 alternatives from AMD have scored big wins when it comes to per-core performance, and Arm implementations such as the Ampere Altra can enable unprecedented density at competitive performance as well. Here’s how they all stand, looking at top-of-stack offerings.
|uArch||Zen 3||N1||N1||Sunny Cove|
|TDP||280 W||?||250 W||270 W|
|L3 Cache||256 MB||32 MB||32 MB||60 MB|
|PCIe||4.0 x128||?||4.0 x128||4.0 x64|
|Chipset||On CPU||?||On CPU||External|
|DDR4||8 x 3200||8 x 3200||8 x 3200||8 x 3200|
|DRAM Cap||4 TB||?||4 TB||4 TB|
At 40 cores, Intel does look a little behind, especially as Ampere is currently at 80 cores and a higher frequency, and will come out with a 128-core Altra Max version here very shortly. This means Ampere will be able to enable more cores in a single socket than Intel can in two sockets. Intel’s competitive advantage however will be the large current install base and decades of optimization, as well as new security features and its total offering to the market.
On a pure x86 level, AMD launched Milan only a few weeks ago, with its new Zen 3 core which has been highly impressive. Using a chiplet based approach, AMD has over 1000 mm2 of silicon to spread across 64 high performance cores and massive amounts of IO. Compared to Intel, which is around 660 mm2 and monolithic, AMD has the chipset onboard in its IO die, whereas Intel keeps it external which saves a good amount of idle power. Top of stack pricing between AMD and Intel is similar now, however AMD is also focusing in the mid-range with products like the 7F53 which really impressed us. We’ll see what Intel can respond with.
In our numbers today, we’ll be comparing Intel’s top-of-stack to everyone else. The battle royale of behemoths.
Gen on Gen Improvements: ISO Power
It is also important to look at what Intel is offering generationally in a like-for-like comparison. Intel’s 28-core 205 W point for the previous generation Cascade Lake is a good stake in the ground, and the Intel Xeon Gold 6258R is the dual socket equivalent of the Platinum 8280. We reviewed the two and they performed identically.
For this review, we’ve put the 40-core Xeon Platinum 8380 down to 205 W to see the effect of performance. But perhaps more in line, we also have the Xeon Gold 6330 which is a direct 28-core and 205 W replacement.
|Intel Xeon Comparison: 3rd Gen vs 2nd Gen
2P, 205 W vs 205 W
|28 / 56||32 / 64||Cores / Threads||28 / 56|
|2000 MHz Base
3100 MHz ST
2600 MHz MT
|2200 MHz Base
3400 MHz ST
2800 MHz MT
|2700 MHz Base
4000 MHz ST
3300 MHz MT
|35 MB + 42 MB||40 MB + 48 MB||L2 + L3 Cache||28 MB + 38.5 MB|
|205 W||205 W||TDP||205 W|
|PCIe 4.0 x64||PCIe 4.0 x64||PCIe||PCIe 3.0 x48|
|8 x DDR4-3200||8 x DDR4-3200||DRAM Support||6 x DDR4-2933|
|4 TB||4 TB||DRAM Capacity||1 TB|
|4 TB Optane
+ 2 TB DRAM
|4 TB Optane
+ 2 TB DRAM
|1 TB DDR4-2666
+ 1.5 TB
|64 GB||64 GB||SGX Enclave||None|
|1P, 2P||1P, 2P||Socket Support||1P, 2P|
|3 x 11.2 GT/s||3x 11.2 GT/s||UPI Links||3 x 10.4 GT/s|
So the 6330 might seem like a natural fit, however, the 8352Y feels better given that it is more equivalent in price and offers more performance. Intel is promoting a +20% raw performance boost with the new generation, which is important here, because the 8352Y still loses 500 MHz to the previous generation in all-core frequency. The 8352Y and 6330 do make it up in the extra features, such as DDR4 channels, memory support, PCIe 4.0, Optane support, SGX enclave support, and faster UPI links.
This review has a few of our 6330 numbers that we’ve been able to run in the short time we’ve had the system.
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fallaha56 - Tuesday, April 6, 2021 - linksure
but when your 64-core part virtually beats Intel's dual socket 32-core part on performance alone?
add the energy savings and suddenly it's a 300-400% perf lead
Jorgp2 - Tuesday, April 6, 2021 - linkThe fuck?
You do realize that they put more than CPUs onto servers right?
Andrei Frumusanu - Tuesday, April 6, 2021 - linkWe are testing non-production server configurations, all with varying hardware, PSUs, and other setup differences. Socket comparisons remain relatively static between systems.
edzieba - Tuesday, April 6, 2021 - linkWould be interesting to pit the 4309 (or 5315) against the Rocket Lake octacores. Yes, it's a very different platform aimed at a different market, but it would be interesting to see what a hypothetical '10nm Sunny Cove consumer desktop' could have resembled compared to what Rocket Lake's Sunny Cove delivered on 14nm.
Jorgp2 - Tuesday, April 6, 2021 - linkYou could also compare it to the 10900x, which is an existing AVX-512 CPU with large L2 caches.
Holliday75 - Tuesday, April 6, 2021 - linkTypical consumer workloads the RL will be better. For typical server workloads the IL will be better. That is the gist of what would be said.
ricebunny - Tuesday, April 6, 2021 - linkThese tests are not entirely representative of real world use cases. For open source software, the icc compiler should always be the first choice for Intel chips. The fact that Intel provides such a compiler for free and AMD doesn’t is a perk that you get with owning Intel. It would be foolish not to take advantage of it.
Andrei Frumusanu - Tuesday, April 6, 2021 - linkAMD provides AOCC and there's nothing stopping you from running ICC on AMD either. The relative positioning in that scenario doesn't change, and GCC is the industry standard in that regard in the real world.
ricebunny - Tuesday, April 6, 2021 - linkThanks for your reply. I was speaking from my experience in HPC: I’ve never compiled code that I intended to run on Intel architectures with anything but icc, except when the environment did not provide me such liberty, which was rare.
If I were to run the benchmarks, I would build them with the most optimal settings for each architecture using their respective optimizing compilers. I would also make sure that I am using optimized libraries, e.g. Intel MKL and not Open BLAS for Intel architecture, etc.
Wilco1 - Tuesday, April 6, 2021 - linkAnd I could optimize benchmarks using hand crafted optimal inner loops in assembler. It's possible to double the SPEC score that way. By using such optimized code on a slow CPU, it can *appear* to beat a much faster CPU. And what does that prove exactly? How good one is at cheating?
If we want to compare different CPUs then the only fair option is to use identical compilers and options like AnandTech does.