E6520 Owner's Thread

Video, especially 3D, relies on speed, not so much bandwidth after a cerain point.

The latency in time is the CAS latency divided by the clock frequency. Therefore, the following are the important numbers to consider regardless of bandwidth since you're limited to the bandwidth of the processor, not the memory:

CL7 cycles @ 1066MHz/sec = .0066 x 10 = 6.60 nanoseconds

CL7 cycles @ 1333MHz/sec = .0053 x 10 = 5.30 nanoseconds

CL9 cycles @ 1333MHz/sec = .00675 x 10 = 6.75 nanoseconds

CL9 cycles @ 1600MHz/sec = .0056 x 10 = 5.60 nanoseconds

CL11 cycles @ 1600MHz/sec = .0069 x 10 = 6.90 nanoseconds

CL11 cycles @ 1866MHz/sec = .0059 x 10 = 5.90 nanoseconds

CL12 cycles @ 1866MHz/sec = .0064 x 10 = 6.40 nanoseconds

CL12 cycles @ 2133MHz/sec = .0056 x 10 = 5.60 nanoseconds

Can you see the pattern here? Regardless of CAS and bandwidth, all these sticks are pretty level across the board when it comes to real world throughput. In regards to a Sandy Bridge CPU like the i7 2720QM, I would much rather run CL7 1333MHz than CL11 1600MHz for the obvious reasons above since the latency speed bump would outweigh the small bandwidth improvement on the higher frequency memory. To see a small but noticeable difference while peaking the i7 2720QM 1600MHz FSB, one would need to find some CL8 1600MHz (5.0ns) memory, but the cost would not be cheap. In the end, we are still talking about 3~5% performance differences so it means nothing at this stage unless you simply want to show your friends some high clock numbers.

The data above was taken from my original post HERE.

Scott

 

Scott I appreciate you taking the time to answer my question. I didn't realize you had posted this before.

 

That's not true. From CL=12 to CL=7, the memory latency only has 1 nanosecond difference. But the real memory latency is around 50ns. So most of the memory latency is from the memory controller, integrated north bridge etc. The memory itselft contributes to very small proportion of the total latency.

So from CL=12 to CL=7, the memory latency only improve ~2%. And there is nearly no performace impovements.

But if you have memory with high band width (1600,1866,2133), the improvements is more effective regardless the memory latency, especially for WEI score

 

I do not agree and would state your position in regards to the board level latency being around 50ns in the systems being discussed here [QM67/Sandy Bridge based] is outdated and not accurate. As explained, both latency and bandwidth are important; especially with the newer embedded on-die memory controllers. I believe we are on the same page there. Regardless, whatever you like seeing in your system and on your WEI report is your prerogative.

Scott




Ref: http://download.intel.com/embedded/processor/prodbrief/324537_5.pdf

 

thanks for the screen tips all... I'm looking for the cleanest 1080p panel.... I dont' care about color gamut... i just want a uniform look (which not mesh patterns, or screen door effect...

so is the samsung panel the best or or the LG?

I have the AU Optronic and it's terrible.

 

Since re-installing OS (win7 pro) to a new SSD, I've lost the on screen display for the volume (when using the volume up/down/mute buttons above the keyboard). I've re-installed the system software to no avail. Anyone have suggestions?
Thanks!

 

You probably forgot to install the Dell applications specifically the control point app.

 

Find my thread on Dell app/driver install order. It will really help with installing everything correctly.

Also, if you installed a Intel drive, make sure to install the intel ssd toolbox.

 

@Scott,

I am having problems installing my BC398 54mm express card with the NEC chipset (uPD720202), I think it is the same one as your one.
I used the pogram/drivers CD that came with the card and and tried some other drivers on the net without luck.
I keep getting the message no driver found or driver error.
Can you please please advice on how shall I install the above express card?

Thanks

 

Hi erblemoof,

So I read all of this thread yesterday trying to figure out if I can add a small SSD without giving up my optical drive. Like you I really like the elegant solution of using a small SSD for my OS etc

So you have at least got it partly working? Have you made any progress in getting it to boot and which slot are you using now the one labelled WWAN or SATA FLASH... and btw wth is a SATA FLASH?