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i have only decreased the resistance of the part on post #86
and i have a gpu-voltage of 1.78 volt ... ya, i know that i am crazy x'D
i have a Colorful 7900 GT 512 MB Infineon 1.4 ns memory ...
tomorrow i will photography my card very sharp
lower resistance of the backside (part on post #86)
= lower VREF but more VDDQ voltage
... but all other voltages are the same like on your card ... like the VDD voltage with 2.1 volt
PS:
sorry for my english, but this forum is my last hope :(
Well we dont think the thing you measure as VDDQ is VDDQ at all.
I think we still suspect the voltage dropping on yours is VREF as you said. Im no expert at this im afraid, hopefully some of the pros will glance over this again and take interest in your findings.
Your English is fine. :)
i hope it also.
probably is the VDDQ voltage ( < what we think/thought) the VDD voltage
>.<
i really dont know
... but i know that our v-ram on the 7900gt 512mb is verly slow :)
tomorrow i will measure the other points on my card, good nite :)
Quote:
Originally Posted by MaSTeR-StyX
Any news so far?
i have penciled the resistor under the resistor on the backside of the card for the VREF ... but it dont help
today i will measure all the points and make some sharp pics.
sorry if smn posted this already, but is there anyway to vmod the core to 1.4V just using conductive ink?
It has been posted that often that I'm not going to explain it again. Just take your time and read this thread, it's somewhere on the first five pages.Quote:
Originally Posted by marauder16
You must not use conductive ink!!! Just a pencil. Read this thread...
thnx, I found it, but I'm still not sure if I should go with 512MB 7900GT, it seems they have many problems, 256MB 7900GT has an easy mod and no problems...
The CALIBRE 7900GT 512MB card uses the reference PCB so mods are the same as the 256MB card :)Quote:
Originally Posted by marauder16
7900gt 512 mb layout is the same like the 6800 GS 512 MB layout ?
hey, thzis is great, thnx man! :toast:Quote:
Originally Posted by alpha0ne
Hi guys and thanks for this great work, I'll do it very soon on my colorful ( and powerful ) 7900GT.
By the way, what about a Vmem Mod ? Did someone search for it, or find it ? My memory sucks at sock voltage ( 770Mhz :( ), I'm sure it'll help.
Thank you,
Kind regards,
Quentin.
I think somewhere in this thread there is a vmem pencil mod, try and find it...
I don't think so..
There is none.Quote:
Originally Posted by quent
GPU clocks are more important than mem clocks, so it's only a "small" issue.
There is a Vmem mod in posts 11 and 12, but it has little to no effect on the mem clocks from the tests that have been done.
I'm 99% sure that it is the correct mod for Vmem, as there are no other regulators on the card which could be used for Vmem regulation. There appears to be something else other than the Vmem voltage which is limiting the mem clocks.
I've attached a picture of how the Vmem mod can be done.
i cant see there a image
there is a different between VDDQ and v-mem voltage ...
i dont know :(
Theres a problem with attachments atm. I'll try to find the origional picture later and upload it.Quote:
Originally Posted by MaSTeR-StyX
Vddq is the voltage supply for the I/O buffers on the memory chips. On this card, it looks like Vdd (the voltage supply for the registers that store the data) and Vddq are tied together.
ya, but our mision is to increase the vdd and vddq voltage i think, because the VDDQ voltage is high enough :)
I'm pretty sure that Vdd and Vddq are electrically connected together on the card, so its not possible to increase Vdd and Vddq seperately. Using the Vmem mod to increase voltage should increase both Vdd and Vddq together.Quote:
Originally Posted by MaSTeR-StyX
Edit: I've attached a picture showing how to do the Vmem mod.
On my Xpertvision, the third resistor down from that long IC measures 2.62 kOhm. I penciled it down to 2.45 or so and on those points marked on the first page (GPU Vcore read and lower right of those 6 big soldering spots) it says I get 1.475 now.
Still, it doesn't solve my artifacting. I 'd like to try the switching frequency mod. Anyone knows how it's done on these cards? PLEASE!!
I dont think that the manipulation of the memory voltage does any good!
As we know from the 256 MB variety, the mem chips have vast reserves. The problem with the 512 MB Boards is probably due to timing inconsistencies of the RAM - the layout leads to corruption of the signals since the data paths have not exactly the same length. Reducing the CAS latency might help- it did a lot on my 7800 card with 512 MB. Reducing the latency by 1 or 2 might lead to much higher frequencies and better performance overall.
The best performance you should therefore see on the cards with the classic layout of the 256 MB type.
So, which of these is CAS latency?Quote:
Originally Posted by Doc Holiday
http://img138.imageshack.us/img138/9...ingset7od4.jpg
hay all i just got this card http://www.newegg.com/Product/Produc...82E16814130034
It's a 512 EVGA GT. I figure for $300 with 512 ram that can easy do 850 you cant go wrong. Now the VGPU mod shgould apply to this card? i havent seen anyone with it yet...
speaking from experience pin 6 is not ground.
http://homepage.ntlworld.com/adam.ne...2mb7900gtR.jpg