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Sapphire 5870 Vapor-X (non reference) Vmods


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Sapphire have done their own PCB for non reference 5870 card which is called Vapor-X. This mod is for rev.2 cards with blue PCB.


There is no possibility to adjust voltages with software, but I don't find this annoying as long as clocks are good.


Here is VGPU, OCP and Vmem mod. (Vmem mod is not tested yet, but it should be correct 100%) Reading points can be found from same picture.

*OCP mod: Tune recistance down to 5Kohm. (9.9Kohm originally) It should be ok up to 1.5V

** Effect: More current can be drawn to GPU

*Vgpu mod: Slowly tune down recistance. On 2D 1.17V is 1.41V in 3D. Those are the settings I use with aircooling

** Effect: More MHz for GPU. Better cooling will give better results.

*Memory Vmod: Tune recistance down slowly. Measure from the leg of coil.

** Effect: May help memory overclocking when using LN2 as a cooling method. May also help with cold tolerance.




Here is memory controller mod. Reading point is on the back side of the card. (Leg of coil)

*Memory controller mod: Tune recistance down slowly. Stock voltage is 1.25V in 3D load. Use the values you prefer.

** Effect: May help memory overclocking when MHz are high. May also be needed while using LN2 as a cooling method.




Here is VPCI-E mod. This is unconfirmed yet, so do not try if you are not sure by yourself.


*VPCI-E mod: Tune recistance down slowly and measure from SMD recistors on the back of the card.

** Effect: May help cold tolerance and overclockability while using extreme cooling methods.




Here is one sample score with mods installed.



1100MHz is almost doable in normal room temp.



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It should be, but the circuit is locked. VID values does not change even you change values by hardmod. Software cannot override hardware in any case.


I think sapphire saved some money with locked vid values on all controllers or something.


I don't mind, cause I like traditional mods.

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  • 9 months later...

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