i7-8086K

[las]

Uhm I delidded a 8086K yesterday. Hit 5.2 GHz at 1.385v With -2 AVX Offset.

Better binned for sure. But probably not worth the extra money anyway. As 8700K have improved since launch too.

 

[qubit]

Has anyone ever thought about buying one of these just for the sake of buying it? You know, something that just sits up on the shelf as a collector's item.

Obviously this would be for people with money to burn. If I had money to burn I buy it just let it sit, hell... I'd buy two of them, one to use and one to keep in the box on the shelf.

That's exactly what like to do. And like you, I don't have the money to burn lol.

 

[xorbe]

edit: never mind seems like software make or makefile issue, I'll hit the Linux forum and try to find out why make behaves differently for HT vs non-HT. Still waiting for the m.2 drive, but using sata ssd to test the 8086K currently.

 

[R-T-B]

Except that he often defends AMD from an objective perspective. Gotta disagree with this fanboy statement.

I mean, you are literally talking about the guy who told me he'd only buy an AMD CPU (no matter how much it outperformed Intel) to "flush it," but ok...

I myself am no fanboy. Owned a Ryzen not too long ago, and my miner is still based on one...

 

[lexluthermiester]

I mean, you are literally talking about the guy who told me he'd only buy an AMD CPU (no matter how much it outperformed Intel) to "flush it," but ok...

If memory serves, that was last year, wasn't it? Maybe I misinterpreted, but he seemed to be saying that in jest.. Could be wrong..

 

[R-T-B]

If memory serves, that was last year, wasn't it? Maybe I misinterpreted, but he seemed to be saying that in jest.. Could be wrong..

I mean, he basically confirmed it here several times after too, as well as more or less here.

I did say he was competent. I do believe he has technical knowledge. But he's definitely a fan of intel above and beyond most.

 

[lexluthermiester]

I mean, he basically confirmed it here several times after too, as well as more or less here.

I did say he was competent. I do believe he has technical knowledge. But he's definitely a fan of intel above and beyond most.

Fair enough, shutting up about it.

So back on topic, what's the final word on the 8086k?

 

[FireFox]

If memory serves, that was last year, wasn't it? Maybe I misinterpreted, but he seemed to be saying that in jest.. Could be wrong..

For sure you misinterpreted, i have never ever said anything in favor Intel's rival, as @R-T-B S said i have ever confirmed it to a point i got in some kind of trouble

In a week or so i have the CPU, couldn't before due an operation.

 

[FireFox]

As promised

 

[dj-electric]

Nice one. Awaiting my sample, should arrive somewhere next week

 

[FireFox]

Nice one. Awaiting my sample, should arrive somewhere next week

Let us know how it performs.

 

[xorbe]

So I tracked down my 8086K performance problems under Linux. It's the KPTI and spectre_v2 mitigations, mostly the latter. Turned 'em off and bam, performing as expected. Magic kernel options are "nopti spectre_v2=off".

 

[FireFox]

Clock speed and voltage?

 

[xorbe]

Clock speed and voltage?

I haven't gotten that far yet, messing around with ram timing/testing in Linux. Installing Win10 for the first time ever (for me) this evening. At first blush I don't think I got an upper-bin cpu.

 

[cadaveca]

Clock speed and voltage?

what's stock voltage on first boot into BIOS? that's some good info to get

 

[FireFox]

what's stock voltage on first boot into BIOS? that's some good info to get

Mine is still in the box, i can't answer that question.

 

[lexluthermiester]

Mine is still in the box, i can't answer that question.

Is it staying in the box as a future collectors item?

 

[FireFox]

Is it staying in the box as a future collectors item?

I will test it because i am getting another one.

 

[xorbe]

Under Linux, the AVX offset seems to apply 100% of the time, rendering it useless. 5.0 GHz is impossible with Prime95, cpu is on fire. Raising the voltage results in hard thermal throttling to less than 4000, and it's still crashing at that point, so that's an exercise in futility. 4.9 to 5.0 is a voltage wall. Aiming for 4.8 here. I'm thinking to use the boost table vs sync all cores, maybe something like 50/50/49/49/48/48 would work.

 

[cadaveca]

Under Linux, the AVX offset seems to apply 100% of the time, rendering it useless. 5.0 GHz is impossible with Prime95, cpu is on fire. Raising the voltage results in hard thermal throttling to less than 4000, and it's still crashing at that point, so that's an exercise in futility. 4.9 to 5.0 is a voltage wall. Aiming for 4.8 here. I'm thinking to use the boost table vs sync all cores, maybe something like 50/50/49/49/48/48 would work.

These chips are binned for over 5 GHz. There's something else going on here.

 

[lexluthermiester]

Under Linux, the AVX offset seems to apply 100% of the time, rendering it useless. 5.0 GHz is impossible with Prime95, cpu is on fire. Raising the voltage results in hard thermal throttling to less than 4000, and it's still crashing at that point, so that's an exercise in futility. 4.9 to 5.0 is a voltage wall. Aiming for 4.8 here. I'm thinking to use the boost table vs sync all cores, maybe something like 50/50/49/49/48/48 would work.

That CPU is designed to hit 5ghz on 2 cores by itself. 5ghz on all cores full time with a slight voltage bump should be easy.

 

[FireFox]

These chips are binned for over 5 GHz. There's something else going on here.

Agree with you, i saw one at 5.0GHz 1.20V all cores and 5.2GHz with 1.27V all cores

Why am i so lazy to test mine

 

[xorbe]

At stock settings, sure I see 4950 with one thread of mprime (Prime95 on Linux). Constant 5GHz is easy compiling Linux, etc. With avx mprime that's a no-go. I don't ever do that typically, but it doesn't give me a fuzzy feeling that there exists code paths to crash the cpu with those settings. It's possible I got a dud cpu -- it likes to error out one thread after 30 minutes or so. Also, the first overclocking compilation errors manifest as mce in dmesg. Maybe I got a cpu with a crap cache / tlb array. It's entirely possible I'm doing something wrong. Part of the reason I'm doing a build is because it's been 4 years since the 4790K, lol. I realize I'm burning money here, it's just a hobby machine for fun.

proof

 

[FireFox]

I forgot to ask Watercooled or Aircooled?

 

[xorbe]

That's the ubiquitous Noctua NH-D15 (with one fan off at the moment) in the pic. [I see I added pic after you posted.]