CPU performance discussion...

[Juraj]

If you pay close to msrp for retail Xeons then yes, that's true. Otherwise it gets very close.

[alexyork]

If you pay close to msrp for retail Xeons then yes, that's true. Otherwise it gets very close.

Well we're talking the difference between around £3k for an i9-based system and £6k for a xeon-based system, trade prices.

[Juraj]

I have been experimenting with AVX(and AVX-512 offset). And here is where I get confused:

1.) AVX instruction seriously do rise the load on CPU (tested) so the -5 (-500Mhz) offset largely advertised around stands, at least if you overclock rather high. (Even SiliconLottery settings for their best chip are 4.5 non-AVX, 4 AVX).
2.) Corona kicks in AVX offset, but.. from what I've understood these aren't deliberately used instructions (and the benchmark doesn't even have them for example).
3.) That would lead me to thinking that I can actually disregard AVX offset if I am going to ONLY use Corona in large multithreaded way. Because what else is there ? Everything else hardly uses the CPU for more than few seconds. Of course if I would forget and start Vray I would shut-down the PC :- ).

But the actual result is that Corona's load still resembles the AVX... it requires voltage somewhere mid-way between AVX and non-AVX. So does Corona 1.7 actually use the AVX-512 deliberately now perhaps ?

Now I am very curious and I think I will build also a Threadripper next week and compare how they actually do when AVX is fully accounted to. The benchmarks sucks in comparison, obviously, i9 runs high but with AVX offset when it will come to actual 1.7 use, the difference might not be that much.

[Juraj]

If you pay close to msrp for retail Xeons then yes, that's true. Otherwise it gets very close.

Well we're talking the difference between around £3k for an i9-based system and £6k for a xeon-based system, trade prices.

Paying for Retail Xeons was the largest mistake of my life 5 years ago :- ). Do go for the i9 in this case then.

[nikoLAB]

@Juraj

Please, write about specification and impressions when you test Threadripper.

[Ondra]

I have been experimenting with AVX(and AVX-512 offset). And here is where I get confused:

1.) AVX instruction seriously do rise the load on CPU (tested) so the -5 (-500Mhz) offset largely advertised around stands, at least if you overclock rather high. (Even SiliconLottery settings for their best chip are 4.5 non-AVX, 4 AVX).
2.) Corona kicks in AVX offset, but.. from what I've understood these aren't deliberately used instructions (and the benchmark doesn't even have them for example).
3.) That would lead me to thinking that I can actually disregard AVX offset if I am going to ONLY use Corona in large multithreaded way. Because what else is there ? Everything else hardly uses the CPU for more than few seconds. Of course if I would forget and start Vray I would shut-down the PC :- ).

But the actual result is that Corona's load still resembles the AVX... it requires voltage somewhere mid-way between AVX and non-AVX. So does Corona 1.7 actually use the AVX-512 deliberately now perhaps ?

Now I am very curious and I think I will build also a Threadripper next week and compare how they actually do when AVX is fully accounted to. The benchmarks sucks in comparison, obviously, i9 runs high but with AVX offset when it will come to actual 1.7 use, the difference might not be that much.

no, we have no AVX512 (AFAIK not even embree supports it for desktop CPUs)

[danio1011]

Did you ever build a 1950x system, Juraj?  Just curious as to your impressions.

[Juraj]

Not yet :- )

[3dboomerang]

nothing wrong with the threadripper - 1950x - as far as i can see.

I'm operating @ 3,5Ghz though, not at the boosted 4Ghz since the PSU is bugging up on me - there's a kernel problem going on, which I think, is MOBO-PSU related, not CPU by itself.. But comp freezes when going over 3,5Ghz. I'm still trying to figure it out tbh. Also 2 memory slots don't work on the MOBO lol so there's something stinky going on.

But all stable @ 3,5Ghz.

MEM: 48Gb
GPU: GEFORCE 1050Ti
CPU: THREADRIPPER x1950
PSU: CORSAIR 550
MOBO: ASUS PRIME X399-A

total price: 2800€ - 3400€ (belgium) - parts ordered from all over europe for cheapest prices (I dont recommend doing this btw)

cinebench: see attahced

if any questions - shoot.

[Sulphurous]

Will GPU bottlenecks have an impact on rendering times? i7-4770k here with an MSI Radeon R9 280X Gaming Edition 3GB GPU

[TomG]

Will GPU bottlenecks have an impact on rendering times? i7-4770k here with an MSI Radeon R9 280X Gaming Edition 3GB GPU

Not rendering with Corona, it's CPU only and doesn't use the GPU at all.