Latency seems high

[The0men]

I have some screens i just took, after getting everest. The Read and write seems high, but my latency seems far higher than i expected. I havnt manually set up sub timings (havnt played much with them, and dont know alot about them) Does any one know how i can reduce this latency. My old A64 @stock with 400mghz cas2.5 Ram has less latency than this.



Memory timings



Any info would be apreciated

[v_parrello]

You have to keep in count the different hardware achitecture.
With A64, memory controller was built into processor, here you have an external memory controller built into northbridge.

In all Intel achitectures the bottleneck is the external memory controller built into northbridge (you have to consider the additional latency necessary to crossthrough this component).

[Obscured]

In all Intel achitectures the bottleneck is the external memory controller built into northbridge (you have to consider the additional latency necessary to crossthrough this component).

That depends on realization of memory controller.
1)Intel can imrove realization with each new chipset.
2)Obviously its realization isn't bad now since intel platforms recieve advantages even from DDR2-667MHz.

[The0men]

Any suggestions how I can improve on this, or is that a decent score for the system specs? Thanks for info.

[v_parrello]

Any suggestions how I can improve on this, or is that a decent score for the system specs? Thanks for info.

You not will be able to reach AMD64+DDR latencies you can only reduce the gap with tighter timings, high FSB and maximum frequency possible form your memory modules. You have to work to try the limits of your system.

@obscured: maybe you did not read my post from the beginning:

You have to keep in count the different hardware achitecture.
With A64, memory controller was built into processor, here you have an external memory controller built into northbridge.

[Obscured]

maybe you did not read my post from the beginning

It looks as if you didn't understand what i'm talking about.

[The0men]

I have pulled TRC and down to 2 and Tras down to 4, didnt bother priming, because i had to use a little more volts to boot, and also, did nothing to latency, can boot with RAS precharge at 3 also, but still didnt find anything to write home to mum about. What about sub timmings, and im already at 2.38-2.4v already, so dont wanna go much higher than that, thats why i havnt raised memory frequency. I could drop 1t and go higher frequency, either way doesnt seem much different...

[Timbosan]

Your tRFC is very high (53) i run mine at 30 it makes a large difference to bandwidth & latency. A Tras of 8 - 12 would give you good bandwidth 4 is a bit low and you'll be losing bandwidth but getting lower latency, and will need more volts to do it.

[The0men]

When i get new waterblock (systems apart right now) i will try drop tRFC and see how that goes. Any one got some everest latency's I can compare with? And system specs and settings would help.

[Timbosan]

Here ya go i will do a new one with my current settings too this was a few weeks ago. My system's in my sig.

[The0men]

In comparison my read bandwidth is huge, but write bandwidth is nothing to write home about. My latency on Ram is good, but CPU has more latency, according to everest anyways. Thats a wicked high FSB dude. Looking at latency i dont know why people are saying to aim for 40 to 50ns in everest, i havnt seen anyones that low. Anyone got similar system that says otherwise?

[Timbosan]

Your read bandwidth is awesome
I lowered my ram voltage to 2.13v for safety, so i have re-optimised the timings.
This is everest at the current 24/7 settings.

[The0men]

Cheerz dude, However i just dropped some of that, and reduced latency in doing so. Infact, i dont quite understand what happened... all i did was put multiplier back up to standard (9) and drop FSB and my latency dropped massively. (ignore the fact that i overclocked a little higher and dropped one timming, i also did this with multiplyer at 8, had little effect, only was able to get it to 50.6ns, so i didnt bother posting) I came across this drop by pure accident because i was seeing where my FSB wall was. (depressed it was only about 460, might have gone higher with more volts, but couldnt be bothered after testing everest back at 9 multiplyer i was happy lol.)

[KiD0M4N]

The strap changes on the P5N32-E SLI at 425Mhz (or 412Mhz) So 450x8 has a much higher latency compared to 400x9.

BTW, your temps are rocking.

[The0men]

hmm, temps even at 100% are pretty low, even the everest stress test doesnt get it much higher than 40 degrees, BUT Orthos gives it a fair flogging lol. Even with lapped CPU, but also, now i have a really cheep waterblock. i Want to get apogee GTX, but they dont have 3/8 barbs for them, so im stuck with a bogus thermaltake W1 (a huge flow restrictor)

[The0men]

the strap explains the difference in latency drop, also i suppose the drop in FSB is the reduction in bandwidth. So Timbosan, if tiy wanted lower lantency i guess same rule would apply. But you would lose bandwidth, i was after less latency not higher bandwidth, so im happy now with results. Still dont see any evidence of getting 40ns though.

[Timbosan]

damn theyre nice results mate i dont have the option to run CR @ 1T, that gives you a big advantage, and i have just done the vMCH (northbridge) mod and have increased voltage from 1.29v to 1.36v - this allows me to run the static read control on "faster" @ 490 FSB (would never boot before) which gives me ~65MB/s more bandwidth and 0.6ns less latency (lol @ the latency reduction). I have an e6300 so im on my highest multi at 7x, i cant go lower on the bus on a higher divider so i am maxing it out on 1:1. Now ive done mod, i may even be able to run ram at 4:5, but that would give minimal if any real world gains. Whats your vdimm?

[The0men]

Vdimm @ bios is 2.325v, actual reading is 2.4v

Any lower and errors in orthos. Stable at 2.4v all day every day, havnt had a problem, but i have a fan above my dimms now.