Diamond Multimedia HD7790 Review - Circuit Analysis

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Circuit Analysis:

Diamond Multimedia HD7790 Review

 The nude card, you can see the four 256MB RAM chips and the five phase VRM. 

 

Diamond Multimedia HD7790 Review

 This is the actual 7790 core, DMM is running this already OCed out of the box at 1075mhz, that is a 75mhz OC compared to the standard AMD HD7790. 

 

Diamond Multimedia HD7790 Review

 They used Hynix based GDDR5 and run 1GB of it at 1550mhz, 50mhz higher than the standard 7790. 

 

Diamond Multimedia HD7790 Review

 Here we have the PWM for the VRM, the NCP81022, possibly 4+1 phase VRM. Currently there are or will be mods out there for voltage control as the vGPU has been locked down by AMD. This is an analog PWM from On Semi so it is a bit easier to mod since they keep things basic.  

Diamond Multimedia HD7790 Review

 Here we have 4 phases for the vGPU and 1 phase for the vDDR. 4928N is the tiny IC with many pins, this is the high-side MOSFET it has a pretty good current rating. The other MOSFET is the 4983N which is the low-side PowerPAK. Both MOSFETs are from ON Semi. The Coiltronics inductors are also of pretty high quality and better than those low prolife laptop inductors you see on many cards from Nvidia, AMD without a doubt does better with power delivery, except controls in this case.

 

Diamond Multimedia HD7790 Review

 Here we have some drivers for the phases, they only say AZU on them, however if you search the ON Semi site enough you will find what they are. NCP5901B is the model number for these drivers. 

 

Diamond Multimedia HD7790 Review

 This APW7165 is a PWM for I am guessing the vPLL VRM. 

 

Diamond Multimedia HD7790 Review

 This is a single phase VRM which powers the vPLL. 

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