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Old 14th Jun 2013, 10:01   #1
Gareth Halfacree
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Intel locks overclocking to K-series Haswell chips

No Turbo Boost adjustments on non-K parts.
http://www.bit-tech.net/news/hardwar...overclocking/1
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Old 14th Jun 2013, 10:30   #2
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Is anyone surprised by this?
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Old 14th Jun 2013, 10:31   #3
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That's weird. If VT-d is absent from the i7-4770K then it's no good to me. Are you absolutely sure about this? Can there possibly be an engineering reason or is Intel just playing silly beggars?
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Old 14th Jun 2013, 10:33   #4
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Originally Posted by Bob Andersson View Post
That's weird. If VT-d is absent from the i7-4770K then it's no good to me. Are you absolutely sure about this?
Completely sure: Intel's Ark page for the Core i7-4770K confirms the fact: while it supports VT-x extensions, it does not support VT-d.
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Old 14th Jun 2013, 10:40   #5
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I was sure that in previous gens it was the bclk that people tweaked, more specifically in haswell the strap. Certainly jj from asus has stated that if you really want you can adjust the strap on the non k parts.
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Old 14th Jun 2013, 10:43   #6
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Yep, I've Googled and it's true. No VT-d support means no i7-4770K for me. I guess the i7-4770 will do fine and as no overclocking means I don't need a top of the range motherboard, RAM or cooling I can up the budget for other stuff. Crazy decision on Intel's part. Maybe a GTX Titan just came into range!!!
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Old 14th Jun 2013, 13:21   #7
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Bob, what do you need VT-d support for?
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Old 14th Jun 2013, 13:58   #8
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High speed access to hardware for virtual machines. Not a particular issue for me right now but within the lifetime of the next build I expect it to be. Even so it's a close call and I fully accept that for many lack of VT-d support in the "K" series CPUs won't be a problem. I'm just thankful I found out in time.
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Old 14th Jun 2013, 14:06   #9
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So they're not even allowing the 4 bins they gave on the Sandy and Ivy non K CPUs?

That's pretty terrible. Maybe the bclk can be used?
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Old 14th Jun 2013, 14:10   #10
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I wonder if Intel's reasoning is because VT-d becomes unstable when OCing. Otherwise, disabling such a feature on a more expensive CPU really doesn't make sense. I'm sure Intel also doesn't like the idea of people buying overclockable desktop parts for server use, since you'd end up saving a lot of money on something that will last much longer.

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Old 14th Jun 2013, 14:13   #11
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The Skt 2011 processors -K and not [or are they all 'K' models?] have VT-d support, it's only the 1156/1150 ones that don't... so want Virtualisation and overclocking? SB-E/IB-E is what you want/need...

EDIT: Apparently the SB-E K series only support VT-d on the C2 stepping...

There is also the AMD option... iirc all their processors have AMD-v or whatever their vitualisation gubbinz is called...
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Old 14th Jun 2013, 14:38   #12
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I think the lack of VT-d issue has been persistent on all K models since Sandy launched.
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Old 14th Jun 2013, 15:16   #13
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Quote:
Originally Posted by Gareth Halfacree
Completely sure: Intel's Ark page for the Core i7-4770K confirms the fact: while it supports VT-x extensions, it does not support VT-d.
Thanks for the quick response, Gareth. In asking the question I didn't mean to question your journalistic credentials: I was in shock!
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Old 14th Jun 2013, 15:40   #14
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It has shirty as they want you to buy a more expensive CPU or a none overclockable one.
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Old 14th Jun 2013, 16:27   #15
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Thanks for the quick response, Gareth. In asking the question I didn't mean to question your journalistic credentials: I was in shock!
Heh! I hadn't taken any offence, don't worry - I was just in a bit of a rush this morning so had to be a bit terse in my reply. It's the TSX-NI that I weep for: developers are hardly going to be rushing to implement transactional memory if half the processors don't support it...
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haswell, intel, ivy bridge, k-series, sandy bridge, transactional memory, tsx, turbo boost, turbo boost bins, vpro, vt-d

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