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i7 920 d0: 4.2Ghz to 4.3Ghz, extra 100Mhz worth the hassle? - Page 2

post #11 of 20
Just for the hell of it, see how high of an overclock you boot. Then, once you get that out of your system, settle on 4.2ghz. It's a good speed to run at. =)
post #12 of 20
I'm going to jump on the "stick at 4.2" bandwagon. I mean- really. Youve been to 4.3, know what it'll take, learned about how it works and what it will do. Gained valuable intel for others... And I personally thank you for doing it. I am currently pushing my throttles forward on my 920 and now I see a plausible ceiling. I'll probably stop at 4g- but it's good to know that there's still some wiggle room.
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post #13 of 20
Thread Starter 
Houston we have a problem. At least I think I have.

My RAM is rated at PC3 10666 or 1333Mhz with default timings of 7-7-7-20-1T.
The CPU runs at 200*21= 4.2Ghz.

I currently have a SPD of 6x thus resulting in an uncore of 12x and giving me RAM speeds of 1200Mhz, which runs fine at RAM stock voltage. However, I have the feeling that the low SPD is causing me major loss in performance. Am I right ?

Anyway, I tried a SPD of 8x (as almost all overclocks have), thus resulting in an uncore of 16x and giving me RAM speeds of 1600Mhz. However, my RAM doesn't like that, causing major instability. I tried bumping up the voltage up to 1.66V but it made no difference.

I tried loosening the timings to 8-8-8-24-1T but that didn't help either... What now ? Is a SPD of 6x indeed a major loss in performance ?

Quote:
Originally Posted by Eno75 View Post
I'm going to jump on the "stick at 4.2" bandwagon. I mean- really. Youve been to 4.3, know what it'll take, learned about how it works and what it will do. Gained valuable intel for others... And I personally thank you for doing it. I am currently pushing my throttles forward on my 920 and now I see a plausible ceiling. I'll probably stop at 4g- but it's good to know that there's still some wiggle room.
Alright, I'll do my best to get it perfectly stable at 4.2Ghz !

You're welcome. 4.4Ghz is also doable on my chip, but requires too much voltage (1.38V-ish) for air to keep cool. 4.2Ghz is indeed a plausible ceiling.
Edited by Freekers - 12/30/10 at 5:56am
post #14 of 20
Sorry to a grammer nazi, but SPD stands for Serial Presence Detect. It's a profile of timings that the motherboard looks for so it knows how to use the ram. The term you're looking for is memory multiplier or memory divider, like "x8 multi" or "the 2:8 divider".

How to get 1600mhz working: Try both the SPD and XMP memory profiles while using 9-9-9-27-2T. If that still isn't stable, raise the vtt (or qpi/dram or uncore) and ram voltage a few steps. If after all that it isn't stable, buy better ram or go back to 1200mhz.

Ram speed isn't very important to overall performance on the X58 chipset. It used to be a big deal, but since Intel moved the memory controller onto the cpu, you get great latencies even at lower speeds. I'd also like to point out that OCZ makes (or used to, they don't make ram anymore) some of the worst ram on the market. If were lucky enough to get 3 sticks that actually worked, their overclockability was usually very poor. If you can't get your sticks working at 1600mhz, it's not your fault, it's the ram.
 
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post #15 of 20
Thread Starter 
Thanks for the reply !

Quote:
Originally Posted by MrLinky View Post
Sorry to a grammer nazi, but SPD stands for Serial Presence Detect. It's a profile of timings that the motherboard looks for so it knows how to use the ram. The term you're looking for is memory multiplier or memory divider, like "x8 multi" or "the 2:8 divider".
Lol, look at my sig

Quote:
Originally Posted by MrLinky View Post
How to get 1600mhz working: Try both the SPD and XMP memory profiles while using 9-9-9-27-2T. If that still isn't stable, raise the vtt (or qpi/dram or uncore) and ram voltage a few steps. If after all that it isn't stable, buy better ram or go back to 1200mhz.

Ram speed isn't very important to overall performance on the X58 chipset. It used to be a big deal, but since Intel moved the memory controller onto the cpu, you get great latencies even at lower speeds. I'd also like to point out that OCZ makes (or used to, they don't make ram anymore) some of the worst ram on the market. If were lucky enough to get 3 sticks that actually worked, their overclockability was usually very poor. If you can't get your sticks working at 1600mhz, it's not your fault, it's the ram.
Alright, I have been experimenting along, and my RAM just won't do 1600Mhz, no matter what voltages or speeds. It won't even post with 9-9-9-27T speeds btw.
I never had problems with OCZ RAM before... I just bought slow RAM. Noob fault I guess. And I believe they still make RAM ?

However, I have found out that I can run my mem on a multi of 8x, thus resulting into 1560Mhz, and an uncore of 17x if I set my CPU speed to 4.1Ghz.

I am not sure what to do now (again). 4.2Ghz with a mem multi of 6x and an uncore of 12x/13x and 1200Mhz of RAM speed.
or 4.1Ghz with mem multi of 8x and an uncore of 17x and 1560Mhz of RAM speed.

Last but not least: Is overclocking your uncore a good idea ? I've read somewhere that you should also overclock your uncore for max performance, but I mostly read that you should keep your uncore at 2x mem multi + 1.

Thanks !
post #16 of 20
OCZ stop making ram about 4 months ago, but they are still alive and kicking in the SSD and peripherals markets. OCZ used to make good ram in the DDR2 days, and their Elpida-based DDR3 ram was top-notch, but everything else was pretty poor.

I'd strongly recommend the 4.2ghz+1200mhz setup over the 4.1ghz+1560mhz. While Folding can benefit from faster ram (especially the bigadv WUs), the higher cpu clockspeed is much more important.

You can try to lower the ram timings at 1200mhz to maximize your efficiency. If 6-7-6-20-1T doesn't work, you could probably hit 7-7-6-18-1T with 1.65v.

Lastly, your uncore only needs to be twice as fast as your ram, but you can certainly run it faster than that if you want. The L3 cache is a part of the Uncore, so that would get get a performance boost, but you'd have to watch your PPD or use a benchmarking program to see if it helps any. LinX and IBT do not count as benchmarking programs.
 
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post #17 of 20
Quote:
Originally Posted by Freekers View Post
I was never good with numbers... nor with language or anything else as a matter of fact. To be honest, I suck pretty hard at life
heh.. that's OK dude, you rule, in your own way, in my book.


-TG
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post #18 of 20
Quote:
Originally Posted by MrLinky View Post
I'd strongly recommend the 4.2ghz+1200mhz setup over the 4.1ghz+1560mhz. While Folding can benefit from faster ram (especially the bigadv WUs), the higher cpu clockspeed is much more important.
I am going to actually check this out after I get these 1st 10 WU's done I am doing now. My folding profile is 3.96 GHz @1800 ram speed. I am going to compare it to my 4.20 GHz @ 1600. ALthough it proabably won't mean a whole lot if all the -bigadv jobs are all different sizes. I have been folding on this machine for about 18 hours straight now, on my 3rd WU. (running now in the "background" while I am browsing around) I can't be 100% sure on the time I started folding since I did not modify the properties of the shortcut to have a larger screen buffer, thus I can only go as far back as 7am today (55% on my 1st WU)

I don't want to fold @ 4.20 until I can stay under 80c @100% load.


-TG
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post #19 of 20
^ A good idea, let us know the results. Also post the timings you used at both ram speeds
 
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post #20 of 20
Quote:
Originally Posted by MrLinky View Post
^ A good idea, let us know the results. Also post the timings you used at both ram speeds
3.96@1800 9-9-9-24 2N
4.20@1600 8-8-8-24 1N

It just got super frakkin' cold here, I can open the window and drop my temps almost 15c..I can easily fold at 4.20now You should see my Advanced Cardboard Channeling System©

It's kind of an odd feeling seeing temps in the 50's while I am folding..

I'd post pics of my kEWLinG SySt1M but, technically, my copyright is still not finalized.


-TG
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