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Sapphire HD5850 Xtreme / HD6850 Volt-Mods (vGPU & vMEM)

post #1 of 3
Thread Starter 
Sapphire HD5850 Xtreme / HD6850 Volt-Mods (vGPU & vMEM)


overview

The PCB is identical to those of HD6850s with AMD reference design. This means these mods can be used for HD6850 as well
A 4-phase switching regulator, which is located between the GPU and output panel, controls the GPU voltage. For the memory a simple single phase switching reg is beeing used.

uebersichtxofd.jpg




voltage measurement

output caps of both switching regs are always a good spot for voltage readings. though the little MLCC at the back of VRAM ICs and GPU will give you a more accurate reading.

messpunkte5trg.jpg


If u are using software like Trixx to adjust vGPU be aware that those values are different to the real voltage. Here's a table with exact measurement:

tabelleaiw8.png
*Spannung=voltage
*Last=load




vGPU mod

IC: CHiL 8214
FP Pin: Pin 4 (VSEN)
original resistance: 12.4 Ohms
recommended VR size: 500 Ohms

vgpuyrdb.jpg
*Masse = ground
*put a 500 Ohm VR between FB Pin and GND




vMEM mod

IC: APW7165
FP Pin: Pin 6
original resistance: 5010 Ohms
recommended VR size: 200k Ohms

Pin 3 is a good ground spot. A pencil mod is possible alternatively

vmem2t04.jpg




overclocking

I did some tests with the integrated benchmark of Crysis. Tested in 1920x1080px, DX10 very high details, HQ 16:1 AF and no anti aliasing.
Max. clocks at default voltages are 850MHz(GPU)/1300MHz(VRAM). With an increased GPU voltage of 1.29V(real) and 1.66V VRAM voltage it runs completely stable and without any artifacts at 970/1340MHz. For now I didn't tested more volts because of the stock cooler and high ambient temps.
Benchmarks will run with more than 1000MHz GPU clock.

hd5850_crysis_970-1340molh.jpg
Edited by mAlkAv!An - 6/9/11 at 4:04am
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i7 2600K Gigabyte P67A-UD4 HD5850 Xtreme 4x4GB Exeleram Black&White DDR3-1600 @ 1.31V 
OSMonitorKeyboardPower
Win 7 / WinSer08 Acer V243H MS Office Edition Rasurbo 650W 
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post #2 of 3
Pretty nice VRM for a low-end GPU.

Never really been an ATI fan, but they typically have nice PCB layouts and clock like mad.
    
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CPUMotherboardGraphicsRAM
E8400, E8600, 980BE T2RS+, P5E3, TA890FXE 8800GTS's,GTX's,GS,Ultra's,9600GT Lots of D9's and some crap DDR3 
Hard DrivePowerCase
Seagate 250GB + 80GB WD for benching TT 875w, Corsair 650TX Custom bench station 
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post #3 of 3
Thread Starter 
I am more a Nvidia fan too but I have to say that both have their advantages and disadvantages. Some ATI cards are very nice and easy to handle for overclocking.

Btw I would never call this low-end. With a slight overclock the performance is similar to a HD6870.
THIS is up-to-date low end biggrin.gif
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600K Gigabyte P67A-UD4 HD5850 Xtreme 4x4GB Exeleram Black&White DDR3-1600 @ 1.31V 
OSMonitorKeyboardPower
Win 7 / WinSer08 Acer V243H MS Office Edition Rasurbo 650W 
CaseMouseMouse Pad
Antec Ninehundred Razer DeathAdder Black Edition Razer Goliathus Speed (mid-sized) 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600K Gigabyte P67A-UD4 HD5850 Xtreme 4x4GB Exeleram Black&White DDR3-1600 @ 1.31V 
OSMonitorKeyboardPower
Win 7 / WinSer08 Acer V243H MS Office Edition Rasurbo 650W 
CaseMouseMouse Pad
Antec Ninehundred Razer DeathAdder Black Edition Razer Goliathus Speed (mid-sized) 
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Reply
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