Palit / XpertVision 7300GT DDR3 Voltmod

[massman]

@ massman: are you sure about the ram, could you give me a link to the datasheet?

http://www.infineon.com/upload/Docum...2005-08-18.pdf

[Rudyn]

delta-clock underclocks the geometric-part of the gpu which often limits the oc.

if you clock with your gpu-core with 500mhz (-100delta), your geometric-part is only running @ 400mhz, so you can normally clock the core higher until you reach the limit again.

Ok, on the 3D clock settings I've got 500 / 500 with a delta value of 0. What is the ideal value I have to put there? Is it 165? My card only max at around 530/780 and if I raise the core again 3DMark score starts to degrading.

I've got the Palit 256MB 7300GT Sonic DDR3

[aycibin]

it is 156(-100),not 165.degrading starts because increasing gpu too much,causes some freezes.framerate also decreases.its normal.ideal value depends on the card or temp.-100 is an average value.you should fine tune later to get the optimal values.

if 500mhz gpu with -100 delta is geometrically runing @ 400mhz,then is the performance equal to gpu @400mhz with delta 0 ? besides;this delta clock is said to be enabled by the card automatically when a game is running.so its like a spare 40-50mhz.when we set delta to a - value,we use this spare mhz next to gpu in stead of using it only while gaming.is this right?if it is so,there will be no change while gaming.

[Rudyn]

Just wondering how much performance you can increase after changing delta to 156. In the end you can add like 40-50 more on the core right? As far as I know performance increasing much from memory boost not core clocks.

I will test that out later as I'm in the middle of reinstalling WinXP

[aycibin]

i think gpu vmod is ok by now.testings can be done later.but how shall we boost mems with vmod on SR58? i still can't find this one on the pcb! i'm going to be starting by this week as my new cooler arrives.

[mitsirfishi]

dont worry rudyn my card when i 1st got it wouldnt overclock at all and i was getting annoyed but try the 91.47 drivers they seem to work good for me and once you got your optimal oc settings from coolbits then just keep working the memory up mine went up to the max it would go so power strip had to come out :P and my card doesnt seem to do the delta thing i opened rivatuner and doesnt seem to do it at all so dont know why

[Fr3ak]

Here are the pictures I promised to upload. Took a bit longer than planned, but better late than never:






And about the delta:
Stock 7300GT has a delta of 0, which means the geo unit runs as fast as the core, in 2D as well as in 3D.
But the geo unit cant clock as high as the gpu in most cases, so you set a lower delta, which means the geo unit runs slower than the gpu.
For example: Lets say your card maxes out at 600mhz core with a delta of 0.
Now you set the delta to a lower value to test what the max gpu speed is. You can take a low value, I use -128 (128 in Nibitor), which is the lowest possible value.
To make the calculation a bit easier, we flash the 600Mhz core card to a delta of -100, which means the geo unit now runs at 500Mhz when the core is set to 600Mhz.
With a delta of -100 the cards now maxes out at 650Mhz core (550mhz geo unit).
Now you have found out that the max of the geo unit is 600Mhz and the max the core can run is 650Mhz => a delta of -50 would be ideal, because the core would run at 650Mhz and the geo unit at 600Mhz.
In practise, it might crash at that speed, so you have to play a bit around with different values, but it should be stable +-10Mhz.

To dislplay the clocks use Rivatuner and enable the OSD, so you can see what everything is clocked at.
If you get a lower 3D Mark score means that the card isnt stable and clocked itself down to stock settings after a wrong calculation.

Edit: I know someone who ran the memory cooled by a 120 Yate Loon at 2.4V. Now he cant run as high as he could before at lower volts, so you might be carefull.
Infineon rates the AFL20 at 1.8V for a reason. Palit runs them with 1.98V. Personally I wouldnt run them beyond 2.1V, apart from a suicide bench session
Going from 1.98v to 2.05V didnt improve mem clocks much. 2-3Mhz only and a high core results in a bigger improvment than memory. With 800Mhz+ a higher memory bandwith might have a bigger effect.

I noticed that above 1.35VGPU doesnt gain you that much. Until 1.35V the core scaled very well, above that its getting worse.

If you want to know how much 3D Marks increased with several speeds, have a look at the pictures I posted at a German OC forum:
http://www.forumdeluxx.de/forum/show...232579&page=15

[massman]

Great post.

What are your results with the delta modding ? (delta -50 is best?)

[Fr3ak]

Honestly I dont know. I am running -128. Havent fine tuned that yet and I dont think I will. 30Mhz more or less for the geo unit doesnt affect scores that much when running 900Mhz+ core.
With the second card I was able to bench up to 615Mhz with a delta of 0 and 720 with a delta of -100. Didnt do further testing, as it takes ages to determine the exact voltage. I upped voltage by 0.2V and tested both cards for max 01,03,05,06 and aq3. Didnt do delta fine tuning, because it already took long enough to find the max speed for each benchmark with a delta of -128.
Maybe there are some values that are faster than others, like -50 being faster than -40, though the clock is slower, I dont know. With my cards the geo unit is limiting me even with a delta of -128 from what I can tell.
When I am done with benching I will fine tune the delta.
I will be running about 800/800 1.35V 24/7. That is 7600GT default voltage, so it shouldnt hurt the gpu. And above that the core needs much more voltage for a better oc.
With 1.5v I can run 845/800, but those extra 45Mhz arent worth the extra 0.15V.
I made a handwritten list about what I can run at what speed and voltage. Will post that aswell when I have the time to.

I am going to get a second stick of ram first, before I continue with the benching. Running 1.7V for half an hour already hurt the max oc of the card, so I only want to bench them once at that voltage.

[massman]

1.7v hurts the max oc ?

Looks very strange to me; I once modded my 6200 to 2.0v and the max. kept the same.

It would be really handy if you post you handwritten results here. I really have to prepare the dice session if I want to do some serious tests

[Fr3ak]

Yes, I lost about 20Mhz of the max possible speed. But the cards behavior was strange at that voltage anyway and I havent tested it again after that.
Windows failed by booting and odd stuff like that.

Could have been as well an issue with my energy provider, I dunno. Wasnt running my ups for the benches, so I cant tell.

[aycibin]

i prefered pencil method and i can say that r23 works fine for gpu vmod!

@Fr3ak: you mentioned SR58 for vmodding mems with pencil.i checked my infenion mems.their standard voltage is 2v so they have some way to go further think but i coludn't see where SR58 is

my vf900 has arrived so as soon as i install it,i'll also put the results for pencil method.my first target is 750+/800+

[mitsirfishi]

alright tell us your clocks and see what you get in 3d mark 03 and 05 when you get it modeed

[Fr3ak]

According to Infineon specs AFL20 is supposed to run at 1.8V. AF20 at 2V. Palit runs the AFL20 at 1.98V.
What rams do you have?

Some of my results can be found here:
http://www.xtremesystems.org/forums/...d.php?t=111799

and here:
http://www.xtremesystems.org/forums/...d.php?t=112886

I am finally getting a second stick of ram, so I will do some final benching once its here.

[mitsirfishi]

your 01 score rocks but i only have a pentium 920 D :/ i gota wait for my asus board to come back which is in the next 5 days running on 2600 barton at 2.2 :P legendary with 5950ultra

hope to get good overclocks from my 920 atleast 4ghz and then im going to be doing some serious benching and vmodding

[aycibin]

mitsirfishi of course! but first of all i need to apply a vmod also to mems

has the code HYB18H512321AF-XP so it is 2v & 1.4ns by def.i checked the datasheets before this is different than other palit 7600GSs i know.

[mitsirfishi]

1.4 ns on stock volts and timmings should do what around 1.6ghz 2v should be fine on ddr3 unless if your going for some hardcore benchmarks :P but you should get good clocks on stock vmemory even ddr2 doesnt require anything much more than 2v or it starts warming up abit . is there any record for a 7600gs on air ? and same for 7300gt's i fancy a go going suisidal

Fr3ak what would you say is the highest voltage i should go with a zalman v900 with the fan flat out as ive already modded my card and i get a reading of 1.4v which i think should be fine or is there anything else you reccommend for air/water/phase

[Fr3ak]

aycibin: I didnt noticed you were talking about a 7600GS all the time.
The mods mentioned are for the 7300GT 256MB, so you might have a different layout.

mitsirfishi: Considering 1.35V is 7600GT stock voltage and 7300GT uses the same g73 chip, 1.4V should be dine fir 24/7 usage.
I am running my cards at 1.35V for 24/7 because they dont clock that much higher with more volts, so I dont want to risk to lose them unnesessarily.

As for benching, its all up to you

[aycibin]

@fr3ak: actually no,the layout is the same with 7300gt.i checked that in each topic also.thats why i'm only interested in this topic i applied r23 mod for gpu successfully(1.15v@1.25v now @660mhz) as it was for 7300gt as you menitoned before.so i need to find where SR58 is for my mems i'm always measuring the voltages & temps to be sure that i'm on the right way.

i will try some records by air i hope

is this right?found on the backside of the card

[Fr3ak]

Yes that looks pretty much like it.
Its close to the vmem regulating chip.

[mitsirfishi]

http://img155.imageshack.us/my.php?image=7600gs7jc.jpg
http://img155.imageshack.us/my.php?image=gpu7ov.jpg
http://img155.imageshack.us/my.php?image=mem4ek.jpg

there you go i hope your pcb is the same as the referance 7600gs

but this is the other 1 for the 7600gs i found

http://xtreview.com/review114.htm that has everything for the 7600gs palit sonic 1 you have good luck modding he got some impressive results

yes aycibin the pcb's are similar and using same core and memory chips in some cases but im sure that is the one you are looking for

and are you sure the r34 and r37 arnt the resisters you need to mod to put some more voltage through it to get the voltage you need or you can you bios flash your gs to a gt and then put its use its voltages 1.35v i think then you would have more on the core then, could use nibitor to raise your voltage...

[Fr3ak]

You cant use nibitor to adjust voltage. That doesnt work for any new nvidia card afaik.
You have to do a hardware mod.

[aycibin]

this is the one i have.i shot them myself


neither referance pcb,nor the pcb in the vmod review.i read that review before(still in my favorites list ).so you see,no design difference with your 7300GTs

i appiled 1.3v from nibitor and yes it doesnt effect anything.now i decreased r23 from 440ohm to 370ohm and reached ~720mhz for gpu.there were some screen defects in 728mhz

is sr58 that i marked right for mems?

[Fr3ak]

Its right for 7300GTs and you have the same layout, so most likely yes.
But you have different ram, so I am not 100% sure.
Pencil iy slightly to see if memory voltage increased.

[aycibin]

also crashed at 1.3v@720mhz after my retry with atitool find max core option.so i did it myself.705mhz was stable and temp was max 53C.

then increased the voltage more.i reached 1.45v@725mhz stable so far with 3dmark03.actually i think this is the highest value that i can obtain by pencil modding for gpu.resistor is full of 5B graphite now temp is max 53C again so its not the problem.but its quite difficult to go further with only modding this resistor.maybe i can also put some graphite on the legs of the chip (pin3 & pin6) you used.