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Posted (edited)
My L643G I wrote about earlier, but after delid and AIO cooling, Grizzly on both, CB15

5.0/4.5 1.189V (measured with DMM)

5.2/5.0 1.328V

 

VID is 1.104 according to OCF board.

 

On LN2 and Z170 OCF - what I tested, it might be able to get higher with same settings

6.0 1.6V -100

6.2 1.6V -120

 

Then below -130 the "fun" begins. It starts freezing under load, nothing seems to help.

Full pot same 6.0GHz profile I saved freezes when I start a bench. Pushing VCC PLL and CPU PLL to 1.8+ helps a bit, but still freezes on higher frequencies, 6.2 no go, while it is ok on higher temps. I will try to get MOCF to test.

6.0 cache booted, didn't test if CB will pass, I wanted to check cores first.

 

Second try today - same thing.

Can boot 6.5 1.73V no problem, can also set to 6800 same volts in Win.

Can't run anything even at 6.0 when full pot - instant freeze on CB15 and CB11.5, have to restart from button on OCF. Before going full pot I tested again the saved profile at -90 6.0 1.6V and it passes no problem.

 

Re-applied grizzly on DIE and IHS before the session, temps were staying under 0 this time.

No cracks, no nothing, but same behavior under full pot. Definitely need to try another mobo before rejecting this chip.

 

Also tried with XMP mem, low cache, 2T on mem, 1.8 CPU PLL, up to 2V VCC PLL, VCCIO up to 1.4, VCSSA up to 1.4.

Tried different bioses, tried higher vCore. Mobo is running without radiaor on MOSFETs and sensors in bios show negative temps (both around -10) when going full pot.

 

PS: Maybe I should stick to AMD, lol. Intel hates me.

Edited by I.nfraR.ed
Posted
Second try today - same thing.

Can boot 6.5 1.73V no problem, can also set to 6800 same volts in Win.

Can't run anything even at 6.0 when full pot - instant freeze on CB15 and CB11.5, have to restart from button on OCF. Before going full pot I tested again the saved profile at -90 6.0 1.6V and it passes no problem.

 

Re-applied grizzly on DIE and IHS before the session, temps were staying under 0 this time.

No cracks, no nothing, but same behavior under full pot. Definitely need to try another mobo before rejecting this chip.

 

Also tried with XMP mem, low cache, 2T on mem, 1.8 CPU PLL, up to 2V VCC PLL, VCCIO up to 1.4, VCSSA up to 1.4.

Tried different bioses, tried higher vCore. Mobo is running without radiaor on MOSFETs and sensors in bios show negative temps (both around -10) when going full pot.

 

PS: Maybe I should stick to AMD, lol. Intel hates me.

Your CPU looking good, just had thermal limit, if your CPU is soldered i think it will fly under load. Unfortunately CPU core temp cant detect under 0 so we cant check delta temp between core & pot.

Posted
Second try today - same thing.

Can boot 6.5 1.73V no problem, can also set to 6800 same volts in Win.

Can't run anything even at 6.0 when full pot - instant freeze on CB15 and CB11.5, have to restart from button on OCF. Before going full pot I tested again the saved profile at -90 6.0 1.6V and it passes no problem.

 

Re-applied grizzly on DIE and IHS before the session, temps were staying under 0 this time.

No cracks, no nothing, but same behavior under full pot. Definitely need to try another mobo before rejecting this chip.

 

Also tried with XMP mem, low cache, 2T on mem, 1.8 CPU PLL, up to 2V VCC PLL, VCCIO up to 1.4, VCSSA up to 1.4.

Tried different bioses, tried higher vCore. Mobo is running without radiaor on MOSFETs and sensors in bios show negative temps (both around -10) when going full pot.

 

PS: Maybe I should stick to AMD, lol. Intel hates me.

 

Did u removed all the black glue that holds the ihs and cpu together? If yes,try to level the ihs up a little bit with dielectric tape or something.Maybe u pressed out all the TIM above the core thats why you have no thermal capacity at all. chip seems really nice btw.

Posted (edited)
Not always good, but seems all L639 scaling better on Cold than L643 (Its great on Air but not scaling good under cold).

 

 

Noooo man, dont tell me it :D...Because my 3rd 7700K is L643...

 

My test for simply OC I did with Windows 10, temp in my room 22C.

HW setup: Maximus IX Apex, AIO cooler Silverstone TD02 SLim

CPU and BIOS setup: manual voltage, CPU clock 5 GHz, HT on, Cache 4500 MHz, RAM 3600MHz, LLC5, no delid yet

 

ES 7700K 1.287V CinebenchR15 5000 MHz 1.325 V, max Cinebench 5100 MHz 1.45V

retail 7700K L641G639 1.168V Cinebench R15 5000 MHz 1.265V

Cinebench 5100 MHz at 1.345V AIO

32123754970_848b16605d_b.jpg

Edited by flanker
Posted
Might be but my 643 scale...

 

Inviato dal mio SM-A300FU utilizzando Tapatalk

To how high? The ones I have tried max out at or below 6.7, with proper scaling based on air results they should do 6.8.

Posted
To how high? The ones I have tried max out at or below 6.7, with proper scaling based on air results they should do 6.8.

Same here. But looks like not a matter of scaling with temp, seems the chip is too hot for -196c

 

Inviato dal mio SM-A300FU utilizzando Tapatalk

Posted

L643 it's also a strong batch, but not all cpu from that batch are good ofc.. My first 7700k L643G218 seems it stops at 6700mhz @ -196 but need to retry and tweak some voltages, well it's not a top notch cpu but it's a good starting point for me ^^

Posted
L643 it's also a strong batch, but not all cpu from that batch are good ofc.. My first 7700k L643G218 seems it stops at 6700mhz @ -196 but need to retry and tweak some voltages, well it's not a top notch cpu but it's a good starting point for me ^^

 

Lol, i have the same batch !!! On single stage not delid can do 5.8 4c/4t 3D bench, but i'm -40 full load. It scale good on cold...

  • Like 1
Posted
Lol, i have the same batch !!! On single stage not delid can do 5.8 4c/4t 3D bench, but i'm -40 full load. It scale good on cold...

Yes it should scale good too with ln2. Only bad has cbb at ~ -130 with mocf and -142 with impact. Then fullpot easy.

 

Inviato dal mio HTC One M9 utilizzando Tapatalk

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