Graphic Cards Fiddling Around With Vram Latencies

S

Shrey

Contributor
i messed around with the timings on my 9600 pro ( samsung ram chips) and it gave me a much better oc.. i could oc the memory from 300 to 375..with stock timings only 315 was possible .. but windows artifacted several times..before i found the right timings..with a bit of research.. is this possible on every card and more over..is this safe????:(
 
How do you change the latencies of your video ram ? As far as I know, I doubt changing the latencies will spoil the ram.
 
I use ATI tray tools...it has quite a lot of options to change vram latencies..and loosening the timings doesnt have any effect on the fps...the higher clocks seem to accelarate the fps more than the latencies...but not all games can take the high latencies.. HL2 seems really sensitive to latency changes.. nfs most wanted has no issues
 
shrey said:
I use ATI tray tools...it has quite a lot of options to change vram latencies..and loosening the timings doesnt have any effect on the fps...the higher clocks seem to accelarate the fps more than the latencies...but not all games can take the high latencies.. HL2 seems really sensitive to latency changes.. nfs most wanted has no issues
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I have an ATI card its an asus X800XT, the drivers (ATI tray tools included) don't have any such latency settings... could you post a screeny of all this happening?? not disbelieving @ all, just want to see the window, that I'm not getting
 
yes the version that comes with the drivers doesnt facilitate timing changes..i had a hard time loading my overclocks with that version (windows would artifact :S ).. will post a screenie ..i benchmark on another partition..will update this post soon

ok there are three tabs for editing timings (THE SECOND TAB HAS LOADS OF OPTIONS) ..i guess one screenshot is proof enough ..will post more if necessary...



and vandal i suggest u download ati tray tools separately ... in the setup that comes with the drivers the latency editing options are hidden by default..whereas in the individual setup u can choose to hide it or show it ...

go to guru 3d :D
 
one more thing..this has to do with volt modding..anyone here who has voltmodded with the pencil method? and how does one know exactly how much graphite to leave on the circuitry?
 
^ That would depend on the resistance/voltage you need. Vmods basically work by varying your resistance, which proportionately varies your voltage.

When making your pencil strokes on say an SMD resistor, you basically offer the current an alternate path to flow through - similar to adding a resistor in parallel. More pencil strokes = more graphite = wider path for the current to flow through, bypassing the resistor = proportionate increase in voltage. You have to be careful though with the amount of graphite you use, since graphite has a very low resistance technically offering the possibility of a short circuit.

Unfortunately theres no exact formula for 'x' pencil strokes = 'y' resistance drop. The only way is to measure the resistance with a multi-meter each time you vary the amount of graphite, and see if the varied resistance would bring about the necessary voltage increase you need. Its precisely for this reason that hard vmods are preferred, since you have an accurate pot to vary the resistance.
 
so the pencil method is mostly guessing then..Trial and error rather...thanks anyway eddy :D ..um have u ever tried the pencil method?..
 
Nikhil said:
No trial and error :P .... if it is error, then your card goes "techboy"....

PS: techboy = kaput right ?? :P :lol:
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yeah stow the jokes though...

@ shrey the old AMD's used ta be pretty tough... I actually know of a guy getting too much graphite on, and then trying to use an eraser... What should be done is maintain a smooth pressure throughout the pencil stroke, to avoid 'blobs', simple because the texture of the surface by nature will cause problems...

Also I've heard that OC'ers use only 1 sided strokes, meaning no up and down, crisscrossing lines, just single strokes in the same direction...
 
shrey said:
eraser :S ..
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eraser.. yeah.. you didn't expect me to say rubber did ya:tongue: .. this dude scribbled, then realised he'd overdone things... and tried to use a :P rubber to 'rub' off the extra pencil lead he'd spread around... I also recommend using a 'B' rated pencil like 2B etc, cause the graphites of a better quality and softer..always a good thing.. those 2 words...:bleh:
 
no i didnt expect u to say RUBBER lol...i sketch a lot so i have all kinds of pencils..:D but i aint using em ..this card is all i got for now..no funds ..BTW.did u try changin the latencies on ur card???
 
shrey said:
so the pencil method is mostly guessing then..Trial and error rather...thanks anyway eddy ..um have u ever tried the pencil method?..
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Exactly! So modify -> measure with DMM -> re-modify your pencil strokes. I did try pencil strokes on an SMD resistor just to measure the effect on resistance - never put it to practice though. Too poor to afford blown cards :ohyeah:

@Vandal, the pencil trick on the AMD's (i.e. unlocking the multi's) were a different ball game altogether. For that, it did not matter how many strokes you used, no experimenting with varying the resistance and stuff. You just needed enough graphite for a good clean conduction line and the only safety precaution was to make sure your pencil marks did not stray to other bridges on the proccy.

And yes, for all pencil mods - you just use an eraser/rubber to undo or rectify what you've done ;)
 
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