Hey, I have the same XFX 6800GT. Voltmods are on vr-zone. For memmod, there are two options. XFX memmod is the same as on Asus cards.Quote:
Originally Posted by MikalCarbine
Here is it: http://sg.vr-zone.com/?i=926&s=1
Good luck :toast:
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Hey, I have the same XFX 6800GT. Voltmods are on vr-zone. For memmod, there are two options. XFX memmod is the same as on Asus cards.Quote:
Originally Posted by MikalCarbine
Here is it: http://sg.vr-zone.com/?i=926&s=1
Good luck :toast:
Vmem mods dont help much if at all.
It does on my GT.
Stock 2V, I'm able to go up to 2,6V
I was actually looking for other mods, like vref and all that funky shizzle people don't think of, and what caps to replace with which for those last extra Hz's
As far as I know all the memory voltages for the 6800's are derived from the Vout2 of the IC. ie.. the Vddq and Vref etc all adjust in proportion, when you do the Vmem mod.
Can an expert here confirm...?
There are quite many (at least slightly) different PCB designs, so I wonder there COULD be a GF6800-card having different voltages for VDD, VDDQ etc.However, it is true that most 6800/LE-cards have a common memory voltage.
Let's see what kind of 6800GT-card Jochenp has...
http://rapidshare.de/files/17592270/6800GThi.rar.html
these pictures are taken with an 8 megapixel cam @ my house.
I don't know the camera very well yet, so quality could be a bit disapointing for such a good cam.
OK.. so the card is excatly the same model as modded in the vr-zone article (?). Have checked/tried out all those tricks yet ? How about bios modification etc. considered in this thread:Quote:
Originally Posted by Jochenp
http://www.xtremesystems.org/forums/...threadid=36541
SikaRippa, I've modded my card explained like the vr-zone article. I can now change my Vgpu and Vmem.
But what do you guys mean with the Vddq and Vref and all that stuff? What exaclty are those?
I want to compare timings with you ***Deimos***
http://www.xtremesystems.org/forums/...5&postcount=12
:D
I have played around with memory timings on the video card for quite a long time. The only two parameters that seem to make a tangible difference (on my card) are tRP and tRCDRD:Quote:
Originally Posted by bigboi86
"18 6Code:hynix datasheet HY5DU283222AF
2.8ns 16 17 10 5 5 2 4 050A1110 05010306 00240305
2.5ns 18 21 12 6 6 3 4 060C1512 05010306 00240306
2.2ns 21 24 14 7 7 3 4 070E1815 05010306 00240407
2.0ns 23 26 16 7 7 4 4 07101A17 05010306 00240407
20 5
12 6
6"
are these the timings you used.. I dont see that you have posted them anywhere... Maybe you have a really REALLY good GDDR on a 6800, or a 6800GS (GDDR3).
EDIT: I just the timings in quotes, twice, with new and old atitool. No improvement. Also tried with tRC=17, and likewise no improvement.
Without volt-mod I can only get about 960. Voltmod makes it 972-984.
The tightest timings, (and also highest fps) without any loss of overclockability are combination of 2.8ns and 2.5ns:
16 17 10 5 5 2 4
18 21 12 6 6 3 4
===================================
16 17 10 6 6 3 4 <- that's it.
All I did was adjust the tRC. It's normally 16, I set it to 17.
This is only an XFX 6800NU.
So I guess mine was set to 17 17 10 5 5 3 4
http://img80.imageshack.us/my.php?im...timings3go.jpg
Edit: My stock BIOS uses 12 14 8 4 4 4 2, I guess the timings I was using is VERY loose. I find better performance with tight timings to tell you the truth. I want to voltmod my ram.
Can you read the label on the memory chips? And if you have acces to multimeter, could you measure your memory voltage? (preferably idle, and under load).Quote:
Originally Posted by bigboi86
This must be some new batch of XFX 6800NU. I had several XFX 6800's including rev1 and rev2, and from everyone in forums I met with one, they all had Hynix GDD3 256Mb memory chips.
Those timings you posted are very aggressive for GDDR @1000Mhz+, and thus I pressume you maybe have some different memory.
You are very lucky ;)
I didn't score higher at 1000mhz though.
This is a 128mb version BTW, and I got ramsinks on them :(, I should have wrote down the numbers before I put them on.
Regardless, getting anywhere near or even over 1000Mhz (WIHTOUT voltmod) is incredible.
what does it say on your capacitor C143.. they are top upper pair, out of 3 pairs on the right side of the card.
Quote:
Originally Posted by ***Deimos***
I'll shut down and take a look in a min :)
505
svp
560
10
That's what my Capacitor reads. I also found out what ram I have.
HY5DU283222AF-22 - Seems to be rated for 900mhz. I guess loose timings allowed me to reach over 1000mhz with the cost of lower performance.
There is one step higher than mine, which is HY5DU283222AF-2 rated for 1000mhz. They should have put those chips on these GFX cards.
hey guys :)
i'm planning to do the cap mods for core and memory but i wonder if 3300µF 6.3V will be ok. should be working right? :confused:
You have good quality capacitors there.. same as mine.Quote:
Originally Posted by bigboi86
However, you ahve 2.2ns GDDR wheras mine is 2.8ns. I should be grateful I got 900-950 at all.. many folks cant even get past 800 :/
Yea, that's pretty sweet man.Quote:
Originally Posted by ***Deimos***
My ram needs more voltage I think.
Ok everybody, I think I figured it out. I accidentally had a IDE ribbon cable blocking the back of the card. Specifically the area with the voltage regulators. Now, although sometimes sporadically high clocks would work, usually they didnt. In fact, I couldnt even get 370 stable. I'm going to try to get a nice heatsink on those.. but there are capacitors in the way.. so need to do some cutting and stuff.
I think the lesson is that a fan blocking at the back there is not sufficient.
Those mosfets get real hot. I'm going to cut up some small ramsinks and epoxy it and add a small fan to the back.Quote:
Originally Posted by ***Deimos***
I should be able to use 1.5v 24/7 then :)
This ribbon cable was reason to ALL your temperature/throttle etc. problems ???Quote:
Originally Posted by ***Deimos***
To add video memory usage to your rivatuner graphs:
1. Open Rivatuner. On main tab, in Target Adapter field click next to the 'customize...'
2. Select Hardware Monitoring (2nd from the right)
3. Click Setup, and then in the 'Hardware Monitoring Setup' window, click Plugins in bottom left.
4. There is a list of .dll, you should have some already selected like NBThermalDiode for temp reading... click next to VidMem.dll to add it and select OK.
5. Finally, you have to add it to the graph. Back in the 'Hardware Monitoring Setup' window, add them in the 'DataSources' list by checking them.. click OK.. you're finished!
At first when I did that testcase, I thought all my problems were finished. I almost got through GT1 at 440!! (still at 1.316V) However, next morning same problems as before. It truely is bizarre.. one hour everything is running super fine at high overclocks and everything, then boom.. and 410, 400 even 390 throttle.Quote:
Originally Posted by SikaRippa
Incidentally, I also changed the GPU throttle slowdown and Ambient shutdown temps both to 85C.
EDIT: I'm about to go back to 1.2V BIOS, and see what happens then.. haven't tried that in long time, and I'm getting buried alive in dozens of excel spreadsheets of (often contradicting) data.
What does that do?