I'm already at 5GHz on Haswell.

 

Just out of curiosity, how did you get to 5Ghz? Always interested to hear about various setups.

 

After goofing around yesterday, I finally settled on 4.9Ghz with an offset of +.300. I think I hit that proverbial wall that folks talk about with regard to Ivy Bridge. I can do 5.0Ghz stable and in keeping under TJMAX but I'd just rather not run so much voltage through the CPU (well over the recommended max of 1.450v) and with so much 90+C* air floating around. The incremental voltage needed to hit anything over 4.7 truly is exponential... thus diminishing returns per 100 mhz. And my real-world performance from 4.7 to 4.9 is barely enough to justify all of the effort...

Just out of curiosity, how did you get to 5Ghz? Always interested to hear about various setups.

 

After goofing around yesterday, I finally settled on 4.9Ghz with an offset of +.300. I think I hit that proverbial wall that folks talk about with regard to Ivy Bridge. I can do 5.0Ghz stable and in keeping under TJMAX but I'd just rather not run so much voltage through the CPU (well over the recommended max of 1.450v) and with so much 90+C* air floating around. The incremental voltage needed to hit anything over 4.7 truly is exponential... thus diminishing returns per 100 mhz. And my real-world performance from 4.7 to 4.9 is barely enough to justify all of the effort...

 

I bought a Devil's Canyon (4790k)  :wink:  Compared to the original 4770k Haswell I had, this thing is a "golden sample" overclocker.  

 

I've been de-lidding since Ivy Bridge came out, so of course I did that for this chip using liquid metal TIM.  I run custom water cooling with massive radiators and powerful fans.  Also, the chip "only" needs 1.4V for 5GHz (1.32V for 4.9GHz).  The chip also does an uncore speed of 4.5GHz and runs RAM at 2400MHz C10 1T timings.  I agree that 4.7GHz seems to be the point at which most 22nm quad core chips start to require ever increasing amounts of voltage.  I had a 3770k that did 4.9GHz at 1.5V, then a 4770k that did 4.8GHz at 1.45V, a 5960x that did only 4.5GHz at 1.4V (8 core chips are not good overclockers), and I switched back to quad core chips for single-thread performance with my current 4790k.  Also, I find that "offset" voltage requires more total voltage than just forcing a higher constant voltage.  

I came across this article last night: http://wccftech.com/intel-inverse-hyper-threading-skylake/

 

Hmm...

 

Might explain the approximate 25-35% increase in minimum frame rates for Skylake vs. similarly-clocked Haswell systems in the FSXMark thread.  I hadn't noticed that previously, only the averages which range from 5% faster to 20% faster than Haswell systems reported in that thread.  

I came across this article last night: http://wccftech.com/intel-inverse-hyper-threading-skylake/

 

Hmm...

 

Might explain the approximate 25-35% increase in minimum frame rates for Skylake vs. similarly-clocked Haswell systems in the FSXMark thread.  I hadn't noticed that previously, only the averages which range from 5% faster to 20% faster than Haswell systems reported in that thread.

 

That sounds very interesting for an application such as P3D which isn't a true multithreaded application AFAIK don't you agree?

That sounds very interesting for an application such as P3D which isn't a true multithreaded application AFAIK don't you agree?

 

Absolutely!  Let's hope it's true.  

Hi.

This is my Golden 4770k. Boot in to win7 @5ghz 1.18v

This is on watercooling ambient 22C

https://dl.dropboxusercontent.com/u/54475361/760/11.10-132.png

 

Today a run a 4790k in the sim , have not test anything in Fsx /P3D yet , only benching 6700k

 

6700k is very promising for sim use, memcontroller really strong wait until good double sided mems with a speed of 3600-3800 cl15-16 arrive . Then we talk.

 

The 25-30% min fps gain is some part DDR4 related ,the same on Haswell-E but approx 20%

Hi.

This is my Golden 4770k. Boot in to win7 @5ghz 1.18v

This is on watercooling ambient 22C

https://dl.dropboxusercontent.com/u/54475361/760/11.10-132.png

 

Today a run a 4790k in the sim , have not test anything in Fsx /P3D yet , only benching 6700k

 

6700k is very promising for sim use, memcontroller really strong wait until good double sided mems with a speed of 3600-3800 cl15-16 arrive . Then we talk.

 

The 25-30% min fps gain is some part DDR4 related ,the same on Haswell-E but approx 20%

 

Nice chip there Hasse, thanks for the info.  If I do upgrade to Skylake, it will probably be a couple months at least because I'm starting a new job next month.  

Hello,

I am currenly running a "old" SandyBridge i7 2700k at 4.7Ghz and thinking about of upgrade to Skylake family. Don't know if worth it or not. I have not upgraded so far because of hot temperatures under OC with next Intel CPU families (IvyBridge, Haswell and Broadwell). I don't have water cooling so 3rd, 4th and 5th Intel CPU families were quite difficult to run for me under air cooling system (Noctua NH-D14).

Now, I am interested in this new family, I read somewhere that Intel had improved thermal features but I cannot know if connection between DIE and HIS is Sandybridge like or not. Does anyone know about OC temperatures with high-end air cooling system?

Thanks. Bye.

I came across this article last night: http://wccftech.com/...eading-skylake/

 

Saw the same article and really got me thinking. Could p3d use this, as its neither a true multi or single core application? And after I finally decided NOT to upgrade.....

Hello,

I am currenly running a "old" SandyBridge i7 2700k at 4.7Ghz and thinking about of upgrade to Skylake family. Don't know if worth it or not. I have not upgraded so far because of hot temperatures under OC with next Intel CPU families (IvyBridge, Haswell and Broadwell). I don't have water cooling so 3rd, 4th and 5th Intel CPU families were quite difficult to run for me under air cooling system (Noctua NH-D14).

Now, I am interested in this new family, I read somewhere that Intel had improved thermal features but I cannot know if connection between DIE and HIS is Sandybridge like or not. Does anyone know about OC temperatures with high-end air cooling system?

Thanks. Bye.

 

I moved from Sandy Bridge at 4.8Ghz on air to Skylake currently at 4.6Ghz on air (NH-D15). Temperature normally around 65C at 1.3V with P3d and RealBench.

 

For performance test see here http://www.avsim.com/topic/329116-fsxmark11/page-49 . For comparison see the spreadsheet here

 

https://docs.google.com/spreadsheet/ccc?key=0ApeEiOXGIvXidG9rNUdkSi13a09fb0JPQU5CektEelE#gid=0

 

I think 4.8Ghz is easily achieveable if you want to risk higher voltages.

I moved from Sandy Bridge at 4.8Ghz on air to Skylake currently at 4.6Ghz on air (NH-D15). Temperature normally around 65C at 1.3V with P3d and RealBench.

 

For performance test see here http://www.avsim.com/topic/329116-fsxmark11/page-49 . For comparison see the spreadsheet here

 

https://docs.google.com/spreadsheet/ccc?key=0ApeEiOXGIvXidG9rNUdkSi13a09fb0JPQU5CektEelE#gid=0

 

I think 4.8Ghz is easily achieveable if you want to risk higher voltages.

 

 

Wow 10 frames/sec increase from 29 to 39 on the low end is pretty significant compared to i2500K overclocked to 4.9.  

I did some asking of folks who are likely to know, Skylake definitely does not have inverse hyper-threading or anything of the sort.  The various architectural improvements, coupled with the massive bandwidth increase from DDR4 are responsible for the increase in minimum FPS we see in FSXMark.  

But inverse hyper threading sounds better.

I am sure there are many like me that are sitting on a Sandy Bridge chip. I use a 2500K running at 4.5Ghz coupled with Gtx 770. If I could get a Skylake 6700K that could possibly reach 4.7/8 that looks like a 30%+ increase over where I am and that would be great for the PMDG 777 in some of the bigger airports.

 

I will wait to see how the chips perform once they are in better supply but I am thinking it may be the time to upgrade.

 

I wonder if DDR4 will help FSX at all?

 

Hamish.

 

The various architectural improvements, coupled with the massive bandwidth increase from DDR4 are responsible for the increase in minimum FPS we see in FSXMark.

What about RAM frequency. Do you think it's worth pushing the boat out with Skylake and opting for high frequency, or low latency as the priority?