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post #3271 of 7222
Quote:
Originally Posted by GRABibus View Post

A lot of people use OCCT here.
i don't use it anymore at the moment as it is a lot of power induced in motherboard and CPU.

Maybe, if you are realbench stable, you will be OCCT stable for several hours with same settings.
but it means that your Realbench overclock has a lot of margin.

I give you an exemple : here is my Relabench stable overclock for my i7-5930K :


It is set for Vcore=1.23V adaptative and I never crash in Realbench with it.
If i decrease to 1.21Vadaptative, I crash in Realbench. So my overclock is optimised, with not too much margin.

If I run OCCT with the same settings, I crash in 30 seconds (I tried).

Stability doesn't work that way.... you're still unstable at 1.23v. Just not as unstable as 1.21v. Essentially all overclocks are unstable to some degree. Compared to stock.

This is why you can undervolt a CPU usually quite substantially at stock and it will still run "stable". Have it running 100% 24/7 and it will crash. Guaranteed. So... not stable. Intel understands this so they throw extra voltage at it to keep it stable. Any Intel CPU should be able to run stock 24/7 at 100% load.

Try running Prime95 for weeks. I have. It always fails after a week or two.

Not stock though.

If I were in your shoes I'd have it at 1.25v for mental reassurance.
Edited by nexxusty - 10/4/16 at 2:10pm
post #3272 of 7222
Quote:
Originally Posted by nexxusty View Post

Stability doesn't work that way.... you're still unstable at 1.23v. Just not as unstable as 1.21v. Essentially all overclocks are unstable to some degree. Compared to stock.

This is why you can undervolt a CPU usually quite substantially at stock and it will still run "stable". Have it running 100% 24/7 and it will crash. Guaranteed. So... not stable. Intel understands this so they throw extra voltage at it to keep it stable. Any Intel CPU should be able to run stock 24/7 at 100% load.

Try running Prime95 for weeks. I have. It always fails after a week or two.

Not stock though.

If I were in your shoes I'd have it at 1.25v for mental reassurance.

We are just talking about OCCT and Realbench here.
Of course all overclokcs are unstable.

I just tell you that I have a Realbench overclock which has never failed (Yet) in Realbench (Hours and hours of session) : this same overclock fails constantly in OCCT in less than 1 minute.
That's it.
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post #3273 of 7222
Quote:
Originally Posted by nexxusty View Post

Well that means OCCT isn't the joke it once was....

So you're saying, without fail a Realbench stable OC will require 30mv more to be stable with OCCT?

I'm definitely going to try to call your bluff on this. If this was true... OCCT would be the only program worth using.

Yes, OCCT requires more voltages than RealBench (and also AIDA64) wink.gif
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post #3274 of 7222
Quote:
Originally Posted by djgar View Post

Nice. As a precaution, you should only use one sensor polling app at a time to avoid conflicts.

Yes, but I never had conflicts until now thumb.gif
Maybe I am going to remount my golden i7-5930K, which is doing Core=4.6GHz core/Cache=4.5GHz in Realbench at 1.21Vcore / Vccin=1.8V / Vcache=1.2V tongue.gif
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post #3275 of 7222
I am also thinking upgrading from i7-5930K to i7-6850K.

Except Memory bandwidth, I will not have more performances than the i7-5930K, right ?

With a Noctua NH-D15, which average overclock should I expect If the chip is not too bad ? (Core and Cache)
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post #3276 of 7222
Quote:
Originally Posted by GRABibus View Post

I am also thinking upgrading from i7-5930K to i7-6850K.

Except Memory bandwidth, I will not have more performances than the i7-5930K, right ?

With a Noctua NH-D15, which average overclock should I expect If the chip is not too bad ? (Core and Cache)

Really depends... I'd say broadwell-e handles memory overclocking a lot better, but cache typically doesn't go as high. Dunno how much of an improvement cache overclocking yields on broadwell E though.
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post #3277 of 7222
Quote:
Originally Posted by DarkIdeals View Post

So have any of you guys had experience with using a water chiller on Broadwell-E? (specifically 6900K and 6950X's that put out more heat etc..?)

I've managed to get the cinebench temps on my rig down to ~72-75C on the hotter cores (Realbench seems to stay around the same, not going over maybe ~77-78C or so) and i'm about to add my GPU's to the loop and put my 420 rad back in the compensate for that etc.. but i'm kinda considering picking up a decent chiller like the Hailea 790 watt 1/2HP one.

I know JPM has his Koolance 800 watt one; i'm kinda curious of how much of an improvement a decent chiller would provide over standard custom water in my system. Trying to decide between enhancing my water loop with more rads etc.. or just getting a chiller. I currently have an XSPC EX 480mm rad, a Black Ice GTX 360mm rad, and the EK XTC 420mm rad that i'm about to stick back in the loop; but i'm considering either swapping the 420 rad for a new 560, or maybe getting a MO RA3 or something: or just getting a chiller like i said. Not really sure if it'd be worth if for me though...

If the rad system you describe is not cooling the system enough you either need better fans or lower ambient temps... it should be plenty of rad space. For example, I have a 5960X(4.7) and 2 TitanX maxwells running with 2 360 rads only... and the system can fold 6 cores with the cards at 1500 (for 2 days). Loop temp never went above 38C according to the datalog in aquasuite. but I had to get cool air into the room. (3 other rigs folding also).

A chiller is just that, it extracts heat from the loop at a rate an ambient rad cannot... unless the rad is sitting in snow. wink.gif
I have the EK EXC-800 and a AquaEuro aquarium chiller, and as Menthol said, any chiller is a refrigeration unit - it's a noisy compressor. If you can put it in a closet or run the loop into the basement with the chiller there (the EK can be set to remote start) it could be a 24/7 thing, otherwise, I use it for those times when ambient is high and I need loop temps below what ambient can do (and a chiller in the room will raise the room temp a lot, so it really needs to be in a separate room). The EK is capable of 0-5C (and maybe below depending on ambient), my aquarium chiller can do about 9C (it is meant for a fish tank).
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Quote:
Originally Posted by GRABibus View Post

I am also thinking upgrading from i7-5930K to i7-6850K.

Except Memory bandwidth, I will not have more performances than the i7-5930K, right ?

With a Noctua NH-D15, which average overclock should I expect If the chip is not too bad ? (Core and Cache)
Some IPC upgrade and memory frequency, but unless you go for more cores, it is a side grade overall IMO. Just clock that 5930K a bit higher and you won;t miss a thing. thumb.gif
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post #3278 of 7222
Intel's maximum officially supported memory speed for Haswell (mainstream) is 1600MHz. They list Haswell Max Memory Bandwidth as 25.6 GB/s. With 1600MHz RAM, you can get within spitting distance of 25.6 GB/s on that platform.

Intel's maximum officially supported memory speed for Broadwell-E is 2400MHz. They list Broadwell-E Max Memory Bandwidth as 76.8 GB/s. However, from what I can see, you need RAM clocked at well over 3000MHz to get anywhere near that bandwidth.

Does anyone know the reason for this apparent inconsistency in advertised Max Memory Bandwidth spec?
Edited by Oubadah - 10/4/16 at 10:03pm
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post #3279 of 7222
So I was able to get my cpu stable at 4.4GHZ with 1.300v...now having trouble with the cache...I've only been able to bump it up to 3.4GHZ 1.250v tried pushing to 3.7GHz with 1.300v and it would just blue screen when running a benchmark or stress test. I'll probably try to push the cpu to 4.5 but I want to get this cache dialed in.

Btw, I've had xmp on? Would it help if I tried to overclock the cache with it off?
post #3280 of 7222
Quote:
Originally Posted by Silent Scone View Post

I think you could probably gain enough to warrant adding rad space, in truth. Also how would you rig the chiller up to the desk build?


Desk build? Not sure if you're referring to "desktop" or if you thought i had one of the inside of a desk PC's or something. Anyway, it's a Caselabs SMA8 i'm using. I would basically just either take the lower back chamber panel off and run tubing across my house to the next room where i'd place the chiller; or drill a couple holes for the tubing with the same placement for the chiller (around 7-8 feet from where i sit; around 10 feet from the PC)
Quote:
Originally Posted by Jpmboy View Post

If the rad system you describe is not cooling the system enough you either need better fans or lower ambient temps... it should be plenty of rad space. For example, I have a 5960X(4.7) and 2 TitanX maxwells running with 2 360 rads only... and the system can fold 6 cores with the cards at 1500 (for 2 days). Loop temp never went above 38C according to the datalog in aquasuite. but I had to get cool air into the room. (3 other rigs folding also).

A chiller is just that, it extracts heat from the loop at a rate an ambient rad cannot... unless the rad is sitting in snow. wink.gif
I have the EK EXC-800 and a AquaEuro aquarium chiller, and as Menthol said, any chiller is a refrigeration unit - it's a noisy compressor. If you can put it in a closet or run the loop into the basement with the chiller there (the EK can be set to remote start) it could be a 24/7 thing, otherwise, I use it for those times when ambient is high and I need loop temps below what ambient can do (and a chiller in the room will raise the room temp a lot, so it really needs to be in a separate room). The EK is capable of 0-5C (and maybe below depending on ambient), my aquarium chiller can do about 9C (it is meant for a fish tank).
I would not recommend a chiller for a gaming rig for everyday use. I have used the EK for a few hours during July when a few nephews were here for the Holiday and wanted to game one night.. worked great, but they were using NC headphones and in-ear monitors.
Some IPC upgrade and memory frequency, but unless you go for more cores, it is a side grade overall IMO. Just clock that 5930K a bit higher and you won;t miss a thing. thumb.gif


I just can't seem to get enough info stating what the average person is getting in temps on water with the 6950X's at this voltage etc.. i see guys like Martin and You saying your temps are lower; then i get guys in other forums who say that my temps of ~75-78C under load during cinebench are perfectly fine, so i literally have no clue what to think. I've tried EVERYTHING under the sun to reduce temps; new pump, new block etc.. i double checked tightening of the new monoblock, i cleaned and drained the loop a dozen times. Nothing seems to work. I just re-added the 420 rad back in, still need to get some fans for it (i can never find screws for the EK XTC rads, nobody seems to sell them anymore and i'm unsure what size they are) and i put the new hardline tubing in, but accidentally ordered 12 Primochill Revolver SX Fittings instead of 14 so i'm short a couple; have to wait to load it up with the hard tubing. I also cleaned out the monoblock and saw some algae growth, so i'm thinking the new clean tubing combined with anti-corrosive pre-mixed coolant could help a bit assuming algae growth could be effecting temps.

Kinda thinking of getting a dual pump top for serial D5's too, not sure if that'd really help either though. I'm at the point where i don't know whether to give up and accept the temps or to keep trying..
 
CPUMotherboardGraphicsRAM
i7 5960X ASUS Rampage V Extreme MSI GTX 1080 Gaming X 16GB Corsair Dominator Platinum 2666mhz DDR4 C15 
Hard DriveHard DriveOptical DriveCooling
PNY CS2211 MLC SATA III SSD WD Blue 500GB 7200rpm Writemaster DVD/CD +/- RW EK Supremacy EVO 
CoolingCoolingCoolingCooling
Mayhem's Pastel Ice White Coolant Coollaboratory Liquid Copper TIM XSPC EX480mm Radiator Black Ice GTX 360mm Radiator 
CoolingCoolingCoolingCooling
EK XTC 420mm Radiator Swiftech MCP655-B 12v Pump EK RES X3 250 Reservoir Bitspower/EK 3/8" x 1/2" Compression fitting 
OSMonitorMonitorKeyboard
Windows 8.1 ASUS ROG Swift PG278Q 27" 1440p 144hz G-Sync ASUS VG23AH 23.5" Passive 3d 1080p 60hz  Razer Blackwidow Chroma Tournament Edition 
PowerCaseMouseMouse Pad
EVGA Supernova G2 1000 Caselabs SMA8 -XXL Window, Ventilated sides/t... Razer Ouroboros Norman Rockwell collection series print Mousepad 
AudioAudio
Sennheiser HD700 300ohm Open Back Headphones SupremeFX Hi-Fi 5.25" Bay AMP/DAC  
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CPUMotherboardGraphicsRAM
i7 5960X ASUS Rampage V Extreme MSI GTX 1080 Gaming X 16GB Corsair Dominator Platinum 2666mhz DDR4 C15 
Hard DriveHard DriveOptical DriveCooling
PNY CS2211 MLC SATA III SSD WD Blue 500GB 7200rpm Writemaster DVD/CD +/- RW EK Supremacy EVO 
CoolingCoolingCoolingCooling
Mayhem's Pastel Ice White Coolant Coollaboratory Liquid Copper TIM XSPC EX480mm Radiator Black Ice GTX 360mm Radiator 
CoolingCoolingCoolingCooling
EK XTC 420mm Radiator Swiftech MCP655-B 12v Pump EK RES X3 250 Reservoir Bitspower/EK 3/8" x 1/2" Compression fitting 
OSMonitorMonitorKeyboard
Windows 8.1 ASUS ROG Swift PG278Q 27" 1440p 144hz G-Sync ASUS VG23AH 23.5" Passive 3d 1080p 60hz  Razer Blackwidow Chroma Tournament Edition 
PowerCaseMouseMouse Pad
EVGA Supernova G2 1000 Caselabs SMA8 -XXL Window, Ventilated sides/t... Razer Ouroboros Norman Rockwell collection series print Mousepad 
AudioAudio
Sennheiser HD700 300ohm Open Back Headphones SupremeFX Hi-Fi 5.25" Bay AMP/DAC  
  hide details  
Reply
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