Hi, I am currently using the "Intel Core i7-5820K" prosessor for my linux hypervisor. Now recently I have found myself in need of ECC memory so I am thinking about making some changes to my system.

What I am wondering is, how does the "Intel Xeon E5-2603 V4" prosessor stack upp against the "Intel Core i7-5820K" for a hypervisor?

Intel core i7-5820k is a 3.3GHz 6-core prossesor, while the Xeon is a 1.7GHz and 8-cores. What matters the most? the cores or the extra GHz?

the "Intel Xeon E5-2603 V4" is quite a bit cheaper so I would most likly be able to sell my i7 to cower the total cost of the Xeon

well, the 2603 is newer and will use a LOT less power for the CPU, and supports the "trusted computing" technology if that's important to you. Also, it can support more ram (1.5 TB vs. 64 GB)

The 2603 is only a 6-core, not an 8 as you seem to think. The 5820 is hyperthreaded, so it's capable of 12 threads, whereas the 2603 has no hyperthreading and so is 6 threads only. With the same amount of cores and a significant reduction in speed, I'd probably stick to the 5820K unless something that it doesn't support is of utmost importance, or you desperately want superior effiency (where the 5820K is at a huge disadvantage).

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A few of the i7's were made with special changes for VM technologies. Almost all the newer Xeon's are made to incorporate VM technologies and to more closely integrate the clients to the host system. This assumes your board has advanced VM support. You may not need all those features.

If the motherboard is more of a soho system and not server then I'd guess the cpu benchmark may reveal the cost to performance.

It's always nice to read up on any performance tests and the boards used in the tests.

I run a lot of Xeon's and they are impressive for server work.

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Thanks for pointing out that the 2603 is only 6-core, and really big thanks for pointing out the non hyperthreading! just assumed it had hyperthreading tbh.

I see that the "Intel Xeon E3-1275 V5" supports hyperthreading and runs at 3.6GHz. Will I be bether of with the 1151 chipsets quad core and hyperthreding, then I will with the "Intel Xeon E5-2609 V4" 8-core 1.7GHz and no hyperthreading?

Mys system currently does not support ECC, witch I find myself needing. so looking to find a solution where I get a capable hypervisor with min 64GBs ecc ram

I'll take 8 real cores over 4 cores + hyperthreading every day, even if it does run slower. That's me though. Also depending on what you're doing, the 1275 v5 still only supports 64 GB ram, while the 2609 v4 supports 1.5 TB. So another advantage of the e5 IMO, even if it's not IMMEDIATELY necessary, it's a little more future-proof.

Also, if you wish to spend the money, you could build your new machine with 2 2609's, while the 1275 is single only.

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Thanks for the reply!

Yea im kinda leaning towards the 2609. I will need to change motherboard aswell, but seeing as I run x99 chipset now, I can stretch it out a bit and just buy one part at the time instead of having to buy the whole bunch at once.

Also, im looking a bit at the "ASUS Z10PA-D8" motherboard witch has two sockets.
How does that work if I only have 1 processor to start with? just work as it would any single socket motherboard, and I can just add the second one whenever I want?
does the second processor have to be an exact match to the first?

You'd need to put the processor in the lower numbered socket, probably cpu0, and it should just work.

To my knowledge, the second processor doesn't have to be identical, but they have to be extremely similar (same TDP, same number of cores, same memory support), so it's easier to do the same. This may or may not be accurate anymore, as this is based on older design of XEON's.

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Thanks! pretty sure im gonne go for the two socket motherboard and 2609 now. got a really good price on the "ASUS Z10PE-D16 WS" from someone who is selling it used locally.