The Intel Xeon D Review: Performance Per Watt Server SoC Champion?
by Johan De Gelas on June 23, 2015 8:35 AM EST- Posted in
- CPUs
- Intel
- Xeon-D
- Broadwell-DE
Memory Subsystem: Bandwidth
As more memory channels complicate motherboard design and can be a problem for dense servers, the Xeon-D, Xeon E3 and Atom C2000 only have two memory channels. This makes quad channel operation a good way to differentiate up to the Xeon E5. The Xeon E3 and Atom are limited to DDR3-1600 as per JEDEC specifications, whereas the Xeon D should be able to command more bandwidth due to the use of DDR4-2133 DIMMs.
We measured the memory bandwidth in Linux. The binary was compiled with the Open64 compiler 5.0 (Opencc). It is a multi-threaded, OpenMP based, 64-bit binary. The following compiler switches were used:
-Ofast -mp -ipa
To keep things simple, we only report the Triad sub-benchmark of our OpenMP enabled Stream benchmark.
Using DIMMs with a 33% higher clock, the Xeon D gets a 25-38% boost in bandwidth compared to the Xeon E3. Basically, every percent increase in clock speed is translated in higher bandwidth. The Xeon E5 has almost twice as much bandwidth for only 50% more cores and should as result do better in some bandwidth intensive applications (mostly HPC).
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julianb - Saturday, October 31, 2015 - link
Thanks for the reply, man.And sorry for my late reply, totally forgot about this thread :)
eva2000 - Tuesday, June 23, 2015 - link
Nice... Xeon D-1540 is awesome, but I wish it was clocked 0.2Ghz higher across the board would be just enough to tip that scale versus E5. Did my own benchmarks at https://community.centminmod.com/threads/2864/ :)extide - Wednesday, June 24, 2015 - link
Thats probably exactly why it ISNT clocked 0.2Ghz higher across the board ;)I'm sure Intel wants to see some space between this and E5.
boogerlad - Tuesday, June 23, 2015 - link
If this was marketed for the consumer market with the ability to overclock, this would outsell everything completely. This is what the enthusiast needs!!!Refuge - Tuesday, June 23, 2015 - link
I don't think this is going to do much of anything for an enthusiast.Unless they are interested in building a server for some experiment or project.
JohanAnandtech - Wednesday, June 24, 2015 - link
I still think the i7 59xx series is a better match for consumers: higher clocks and thus ST performance. The Xeon D most interesting features such as integrated 10 GBe and low power don't interest most performance consumers. Most people will have a hard time saturating a 1 GBe line and power savings are not a priority.tspacie - Wednesday, June 24, 2015 - link
Seems to tick all the boxes for a software development machine. Very good at compilation. Reasonably priced for the performance. Low power. ECC memory. I'm temptedextide - Wednesday, June 24, 2015 - link
EXACTLY what I was thinking!MrSpadge - Saturday, June 27, 2015 - link
I would be very tempted by such a chip as well, using it for BOINC. However, Broadwell looses some of the power efficiency advantage if you push it harder, i.e. the largest gains are at low and moderate frequency. Perfect for such server chips and mobile ones, but not so much for people aiming for 4+ GHz.MaxKreimerman - Tuesday, June 23, 2015 - link
Sounds impresive in just 45w package, but imposible to find in the retail sites such as newegg or wiredzone