Core i7 940 Review Shows SMT and Tri-Channel Memory Let-down

[niko084]

these is not differend in a dual pack or a tripack there both pysical and technical the same
if i buy 3x 1gb single or 3 paks of 2x2/2x1 or a 3 pack it all runs trichannel can also run dual channel
i wil profe to you that 3x dual channel pack can run tri channel once i got my stuff

You can also verify that its running in dual or tri channel in the bios as well as the os.

 

[PP Mguire]

Holy Jesus you guys know to much! Yall sound like my damn dad where this signal thing is concernd.

 

[niko084]

Holy Jesus you guys know to much! Yall sound like my damn dad where this signal thing is concernd.

Some of us are into more than computers...

 

[PP Mguire]

Yea he has a few electronic and other degrees besides audio engineering. When he starts talking about that kinda stuff i get so lost.

But yea what they where saying, its like the old days of dual channel. You dont need a special kit because its all the same. I never ran matching ram and it ran in dual channel.

 

[niko084]

Please prove it to us later. But what's the point if we already know the answer?
Sure, you will get like some points more for trying to enable tri-channel on dual-channel type of RAMs thus making tri-channel to look bad.
But the real tri-channel will give you MORE points, that's the fun part.

Will you be getting the evaluation samples? or the mass prod. version?

So now its Fake VS Real Tri-Channel huh....

Buddy take a hike or show some evidence outside of marketing hype.

 

[BOSE]

2. Certified version of Tri-Channel memory shows large performance gain.
3. Circuitry differences.

Says Who?? Where is it stayed?

 

[Morgoth]

can you tell me what pysical and technical stuff is differend from a dual pack/ single modules from tri channel pack

i'm not talking abouth the package

i pre-ordered the msi x58 epclipse board and the webshop allready sended it to me

 

[masterbw2000]

That's definitely a secret as of now from the memory manufacturers but they did say that there are differences. Like I said earlier, I doubted initially too and tried 3 identical sticks out of two dual chan kits, compared with just 2 sticks, then benchmarked it.

 

[Morgoth]

and how many % increas was it? got a source?
what memmory modules did you used?

 

[niko084]

and how many % increas was it? got a source?
what memmory modules did you used?

And how about a few screen shots of the benches...

 

[masterbw2000]

Sorry, I would love to but unfortunately I can't, and I am sure ya'll understand.
Please just wait till Morgoth gets his stuff and then we will find out. Thank you.

Patience is a virtue.

 

[BOSE]

Sorry, I would love to but unfortunately I can't, and I am sure ya'll understand.
Please just wait till Morgoth gets his stuff and then we will find out. Thank you.

Morgoth is allowed to post the info and screen shots and you cant?? Thats BS dude.

You sir, are a liar and hypocrite.

 

[masterbw2000]

Dear BOSS, thanks for the comment.

I don't need to please you.

http://forum.coolaler.com/showthread.php?p=2185937
http://forum.coolaler.com/showthread.php?t=191847

Yup, diff RAMs mix-up.

 

[niko084]

Tri channel will help prevent bottlenecks as we all go 8GB+ in our systems, and i think we need benchmarks with MORE than a measly 2GB of ram, before calling it a failure.

I think this is more the issue, than the idea that its not running in tri channel.

 

[BOSE]

Dear BOSS, thanks for the comment.

I don't need to please you.

http://forum.coolaler.com/showthread.php?p=2185937

Look at the ram sticks in this picture two of them are they same and one of them is different. Durrrrr!!!!

http://www.coolaler.com.tw/coolalercbb/INTEL_I7_EXTREME965_X58/30.JPG


p.s. He is using G.Skill RAM, and they haven't made Tri-Chanel kits yet!

A better pic of his RAM. Two black sticks and one silver stick.

http://www.coolaler.com.tw/coolalercbb/ECS_9800GTX+SLI/12.JPG

 

[swaaye]

This CPU isn't designed for games that can only use one or maybe two threads. Nehalem is probably going to look disappointing if you want more speed for such apps. But man, if you give this thing an app that can pound all 8 threads, it eats every other CPU alive. The whole architecture is designed to extract more performance from each core when there are many threads.

I don't know of any game that will really leverage the design here. SupCom is probably the most aggressively parallelized game engine and it can't peg more than about 3 cores. This chip may be ahead of its time...

 

[PP Mguire]

That dude just got owned by his own linkage. Take a hike bro these guys dont tolerate liars!!

 

[masterbw2000]

I knew you'd say that.
So take a look at the results from certified ones later.

 

[DarkMatter]

Dear BOSS, thanks for the comment.

I don't need to please you.

http://forum.coolaler.com/showthread.php?p=2185937
http://forum.coolaler.com/showthread.php?t=191847

In those links (in the second one, with 6 identical sticks) we can clearly see how it's not benefiting from the triple channel even one bit. The memory running at 1800+ Mhz is ~40% faster than 1333 Mhz. If we add that 40% to the ~15000 MB/s results in the OP graphs we get no more no less than a theoretical ~21000 MB/s, around what the guy is getting with his overclocked PC. No benefit with triple channel.

I knew you'd say that.
So take a look at the results from certified ones later.

So where are those results? Or are the ones in the second link (which you added after an edit) the ones with certified modules?

 

[BOSE]

This is with new A-Data Tri-Chanel Kit. Its posted on this website btw.

link - http://www.techpowerup.com/73397/A-DATA_and_ASUS_Demonstrate_Intel_Nehalem_s_DDR3_Performance.html

pic - http://www.techpowerup.com/img/08-10-09/a-data-x58-ddr3-bench.jpg At 2000Mhz




And this is same test done by the guy from the link you provided earlier. He is using G-Skill RAM.

http://www.coolaler.com.tw/toppc/I7920/20087.JPG At 1867Mhz


As you see, the read and write speeds of both RAM kits is almost the same. Thus proves the point that you just got OWNED!

 

[niko084]

Alright chill out guys, all we are really showing is that with "current" software that "has" been used to test tri channel ram, we see nothing that makes us want to buy it.

While I doubt you will need a tri-channel kit for it to work, I do believe that tri-channel will show its benefits down line with proper application.

 

[DarkMatter]

This is with new A-Data Tri-Chanel Kit. Its posted on this website btw.

link - http://www.techpowerup.com/73397/A-DATA_and_ASUS_Demonstrate_Intel_Nehalem_s_DDR3_Performance.html

pic - http://www.techpowerup.com/img/08-10-09/a-data-x58-ddr3-bench.jpg At 2000Mhz




And this is same test done by the guy from the link you provided earlier. He is using G-Skill RAM.

http://www.coolaler.com.tw/toppc/I7920/20087.JPG At 1867Mhz


As you see, the read and write speeds of both RAM kits is almost the same. Thus proves the point that you just got OWNED!

Hmm it's interesting that 200 Mhz more didn't help increasing the bandwidth over what 1800 Mhz offered. Considering 20000 MB/s is also below what DDR3 1800 Mhz should offer in comparison to 1333 Mhz's 15000 MB/s (considering same efficiency in both cases), I think we can take one note: Nehalem CPU when overclocked to ts limits, in that specific benchmark can only offer 20000 MB/s and probably on stock it can "only" give 15000 MB/s, which is much better than Core2 anyway. My point is that maybe, in that benchmark, the memory is bottlenecked by the CPU!

It's not surprise to me anyway: Memory performance has increased a lot in recent years, while CPU doesn't. We have gone from memory bottleneck situations before 2004 to diminishing returns with more than DDR2 667 in 2008.
A CPU that is 33%-50% faster than Core2 will never be able to use a lot more than 33-50% more memory bandwidth than Core2, but due to proper usage of DDR3 and the IMC, the available memory bandwidth is much much more. Also thanks to the IMC it CAN couple with more REAL bandwidth that that 33-50% increase, but it still has a limit.

Adding a third channel increases the theoretical bandwidth but because the CPU can't work with such high bandwidth we see no gains. Keep in mind DDR3 1333 has a theoretical peak bandwidth of 10800 MB/s per channel (21600 MB/s in dual, 32400 in triple channel) so at 15000 MB/s in DC is way below that mark. On the other hand in the charts we can see the single channel one is sitting at 10300 MB/s, pretty close to it's peak bandwidth, one more detail that makes me think I'm right about this.

 

[Basard]

summing it all up... sorta.... ya, this cpu will be cool, when crysis 6 comes out... lol

 

[PP Mguire]

Im glad im just looking at an e8400. These seem to be a whop.

 

[DarkMatter]

Well, I wouldn't say so. Just because Nehalem doesn't seem capable of using all the bandwidth it has unlocked by himself, that doesn't mean it's a fail. It's still way faster than Core2 clock for clock and has a lot more bandwidth even on single channel mode! SMT also seems to work very well.

It's maybe not worth it for games, but for everything else is faster enough to justify the expenses for many people (not me TBH), just as any other new CPU. Don't forget it's suposed to be aimed at the server market. Off course an upgrade from a C2Q is not worth it either, but if you were to build a completely new PC and you care about more than gaming, Nehalem is worth a look or two.