Thank you jwaltos.

The fact is that I want to build a system that will last for years 2-3 at least), so I'm not all that interested on the second hand market.

Also, I think I would need a Z170 - X99 Intel chipset on the motherboard to fully take advantage of the new generation processors.

Finally, as the system should last 3 years, I'm not prone to overclocking.

Anywaay, your ideas will be taken into consideration for a different project, thank you again.

:et_:

[QUOTE=Prime95;423897]Check out my dream build thread:

[url]http://www.mersenneforum.org/showthread.php?t=20795[/url]

For me, the most cost effective solution is Skylake, overclocking memory only and no GPU. I'll be going that route because I think only DDR4 can reliably and cost effectively overclock to 3000+. In Europe, where electricity is probably more expensive than the U.S., it is even more important to go with a power-efficient system.[/QUOTE]

Thank you George, I wsa following your post when I decided to build a new PC for my birthday :smile:

I will definitely go for 32 GB of DDR4 RAM. I guess I should take the DDR4-3200. Should I opt for 2x16GB or 4x8GB?

[QUOTE=ET_;423899]I will definitely go for 32 GB of DDR4 RAM. I guess I should take the DDR4-3200. Should I opt for 2x16GB or 4x8GB?[/QUOTE]

If you go Skylake, I would go 2x16GB so you can populate the other slots later. Using 2 sticks usually allows higher overclocks than with 4.

If you go Haswell-E, I would go 4x8GB to use all 4 memory channels.

[QUOTE=Mark Rose;423907]If you go Skylake, I would go 2x16GB so you can populate the other slots later. Using 2 sticks usually allows higher overclocks than with 4.

If you go Haswell-E, I would go 4x8GB to use all 4 memory channels.[/QUOTE]

Do you mean that Haswell-E has quad-channel memory while Skylake has not? :loco: <-- that's me trying to understand...

The current Skylake models does not have AVX512, you would have to wait for Xeon Skylake in 2017 or maybe Skylake-E?

[QUOTE=ET_;423860]Thank you Andreas. But I heard that Intel is going todrstically shorten the life of Broadwell to enhance Skylake and future generation processors. I'd end up having again an "old generation" processor.[/QUOTE]

I'm not sure what the "generation" matters now that there is no AVX512 in Skylake. Broadwell-E with 6, 8 or 10 cores will definitely be faster than Skylake 6700K 4 cores, specially with quad channel RAM vs Skylake's dual channel. Even Haswell-E with 6 or 8 cores is probably faster.

The Extreme edition of each generation lasts much longer than the "normal" version. People with Sandy Bridge-E had no real reason to upgrade to Ivy Bridge or Haswell. Not until Haswell-E.

[QUOTE=ATH;423910]The current Skylake models does not have AVX512, you would have to wait for Xeon Skylake in 2017 or maybe Skylake-E?



I'm not sure what the "generation" matters now that there is no AVX512 in Skylake. Broadwell-E with 6, 8 or 10 cores will definitely be faster than Skylake 6700K 4 cores, specially with quad channel RAM vs Skylake's dual channel. Even Haswell-E with 6 or 8 cores is probably faster.

The Extreme edition of each generation lasts much longer than the "normal" version. People with Sandy Bridge-E had no real reason to upgrade to Ivy Bridge or Haswell. Not until Haswell-E.[/QUOTE]

Here is a good reason to ask here :smle:

Now I need a comparison table with prices (of processsor+MB) versus efficiency.
From what I see, the Haswell-E has a price that's 2.5x of Skylake, and I suppose that also motherboard with LGA2011 socket cost more than those with LGA1151.

But Haswell-E is not 2.5x more efficient than Skylake.

Where did I go wrong? :confused2: :confused:

There are 3 different Haswell-E: 5820K, 5930K and 5960X:

[URL]https://en.wikipedia.org/wiki/Haswell_(microarchitecture[/URL])
[URL]https://en.wikipedia.org/wiki/List_of_Intel_Core_i7_microprocessors[/URL] (search for "Haswell-E")
It says release price \$389 , \$583 and \$999. You can better check the actual price in the stores you have near you or that you want to buy from.

Of course the 5960X is not 2.5 times faster than 5820K or the 6700K. You pay exponentially for the last bit of power. It always depends on funds and how fast you want/need.

[url]http://www.cpubenchmark.net/high_end_cpus.html[/url]

5960X: 15,978
5930K. 13,629
5820K: 13,000
6700K: 11,012

No idea if this is with quad channel RAM on the Haswell-E or not.

[QUOTE=ET_;423909]Do you mean that Haswell-E has quad-channel memory while Skylake has not? :loco: <-- that's me trying to understand...[/QUOTE]

Yes.

Haswell-E has quad channel. Skylake has dual channel (even if there are four slots).

[QUOTE=ET_;423909]Do you mean that Haswell-E has quad-channel memory while Skylake has not? :loco: <-- that's me trying to understand...[/QUOTE]

You understand correctly. But. I'll bet you can build two Skylake systems for the price of one Haswell-E system.

There is no right answer to your computer quest. One Haswell-E system will definitely be more powerful than any Skylake system you can build. Only you can decide if that is worth the substantial extra cost.

[QUOTE=Mark Rose;423919]Yes.

Haswell-E has quad channel. Skylake has dual channel (even if there are four slots).[/QUOTE]

Quad channel rocks. :smile:

I ran across this just now when digging for actual differences in things (ddr3 vs ddr4 and dual vs quad):
[URL="http://www.corsair.com/en-us/blog/2015/september/ddr3_vs_ddr4_generational"]http://www.corsair.com/en-us/blog/2015/september/ddr3_vs_ddr4_generational[/URL]

My only DDR4 system is quad channel @ 2133, so even though I wouldn't mind having faster RAM (the server doesn't support more than that) it didn't seem like it makes as big a difference as simply having quad instead of dual channel. By far.

You could imagine what it would look like when the Skylake-E stuff rolls out with quad channel. I think that's when I'd see servers with faster DDR4 module support. As it is, Haswell-E maxes out at 2133.

Looks like Broadwell-E bumps DDR4 up to 2400 MHz. I didn't see any reliable info on what the speeds will be for Skylake-E... still too far out to predict.