Yay.. Intel ARK in error... again

[jgreco]

So... Where the hell are we supposed to get reliable information on Intel products?

I'm guessing you probably want to decapsulate your processor and take a look-see. Probably need a magnifying glass the size of the Hubble though.

I'm kinda puzzled that he didn't look at this a little more thoroughly before just jumping over to the Intel forums. Is the BIOS showing it as hyperthreading enabled? (if so, then you can select whether or not to disable it). Do other operating systems show it as HT-capable?

I do actually remember around release time that there was some confusion about hyperthreading on the 2603/2609 but since I hate 'em both I ignored it.

 

[Tywin]

The datasheet says "Each core supports two threads (Intel® Hyper-Threading Technology)". But not all SKUs support Hyper-Threading Technology, which means they don't feature 2 threads per core. On page 2 it is said that "Hyper-Threading Technology requires a computer system with a processor supporting HT Technology [...]" as well.

I still think you are reading more into the literal text of that datasheet than is there to match your existing understanding.

Have a look at xeon-e5-v2-spec-update.pdf pages 17ff, where you will find that the specific SKU 2603 v2 is listed with a few notes, the numbers 4 and 5 of which declaring that Hyper-Threading and TurboBoost are not available with these specific SKUs.

Excellent! Tables 7, 8, and 9 are actually what I was looking for when I first searched for the datasheet, thanks :) I think you should take a closer look though, in Table 8, E5-2603v2 (SR1AY) is listed with notes 1, 2, 3, and 7, but does not have notes 4 and 5. That is, according to this table, the E5-2603v2 does support Hyper-Threading and Turbo-Boost. (We might be looking at different versions; my says spec update January 2015).

SR1AY | S-1 | E5-2603v2 | 0x306E4 | 1.80/1333/6.4 | NA | 80 | 4 | 10 | 1,2,3,7

@HoneyBadger I think you will be relieved to note that Table 9 has two entries for the E5-4627v2, both of which include note 4 (i.e. no Hyper-Threading):

QF77 | M-1 | E5-4627v2 | 0x306E4 | 3.3/1866/7.2 | 2/2/2/2/2/2/ 2/3 | 130 | 8 | 16 | 1,2,3,4,6,7
SR1AD | M-1 | E5-4627v2 | 0x306E4 | 3.3/1866/7.2 | 2/2/2/2/2/2/ 2/3 | 130 | 8 | 16 | 1,2,3,4,6,7