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AMD vs Intel Processors - Virtual Machines

#1iscareu13Posted 7/22/2014 6:37:02 PM
I have read in multiple different locations that the AMD FX-8350 is awesome for virtual machines, while the Intel i7-4770K isn't good for virtual machines.

What exactly is the main difference here that causes the difference?
(or am I just completely misinformed)
#2ShubPosted 7/22/2014 6:51:21 PM(edited)
It's not an Intel vs. AMD thing, it's just the lack of support for Intel VT-d (a.k.a. IOMMU) on Intel "K" processors that's a major downside. You can still virtualize fine on an i7-4770K but you won't be able to do certain things like directly mapping a hardware resource to a VM instead of virtualizing said resource. For example VT-d would allow you to link your video card directly to a VM so you could fully leverage it, i.e. game inside a VM without a major loss in performance.

You can get an i7-4770 and get VT-d, though. And I believe all AMD FX CPUs support IOMMU, so that's an advantage.
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#3Orestes417Posted 7/22/2014 7:02:24 PM(edited)
The visualization extension are one of the reasons I went 8350 over i5 back when I built my current system. That said, I had very specific things I wanted to do and the background to know how to do them. Your average user isn't going to fall into that category and for typical use the difference doesn't matter.

Basically if you had the specific need of the vt-d/iommu extensions you'd already know what you had to do to get it running. It's not the sort of thing you just check a box on virtualbox and enable. You'd also be aware that the motherboard has to support it as well as the processor and if you wanted to dedicate a graphics card to a VM that would have to support it as well.
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#4SinisterSlayPosted 7/22/2014 7:05:18 PM
Really the k's don't support hardware assisted virtualization?
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#5Orestes417Posted 7/22/2014 7:06:57 PM
No, the Ks support hardware assisted virtualization just fine. They don't support the much more specialized directed IO tech that allows things like http://michaelmk.blogspot.com/2012/06/gaming-on-gentoolinux-via-xen.html
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Some roads you shouldn't go down because maps used to say there'd be dragons there. Now they don't, but that don't mean the dragons aren't there.
#6ZethPosted 7/22/2014 9:43:26 PM
The new Devil's Canyon Intel processors (4790K and 4690K) support VT-d

http://ark.intel.com/products/80807/Intel-Core-i7-4790K-Processor-8M-Cache-up-to-4_40-GHz
http://ark.intel.com/products/80811/Intel-Core-i5-4690K-Processor-6M-Cache-up-to-3_90-GHz
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#7Orestes417Posted 7/22/2014 9:47:22 PM
Bout bloody time Intel stopped playing cute games with extensions for market differentiation
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Some roads you shouldn't go down because maps used to say there'd be dragons there. Now they don't, but that don't mean the dragons aren't there.
#8ShubPosted 7/23/2014 7:18:39 AM
Zeth posted...
The new Devil's Canyon Intel processors (4790K and 4690K) support VT-d

http://ark.intel.com/products/80807/Intel-Core-i7-4790K-Processor-8M-Cache-up-to-4_40-GHz
http://ark.intel.com/products/80811/Intel-Core-i5-4690K-Processor-6M-Cache-up-to-3_90-GHz


Very nice, I didn't even know!
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-What is best in life?
-To crush your enemies, see them driven before you, and to hear the lamentation of the women.
#9PraetorXynPosted 7/23/2014 9:21:59 AM
The LGA-2011 CPU's support VT-d as well. I'm planning on an i7-5930K for my build sometime next year.
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