der8auer Posted January 5, 2014 Share Posted January 5, 2014 AMD HD 5970 reference PCB Pics: vMod: Quote Link to comment Share on other sites More sharing options...
nickolp1974 Posted November 4, 2015 Share Posted November 4, 2015 Is there voltmod for mems available? Quote Link to comment Share on other sites More sharing options...
xxbassplayerxx Posted November 5, 2015 Share Posted November 5, 2015 Looks like there are two possibilities. There's a third Voltera VT1165 chip on the front and there's also a uP6101 on the back. Not sure which one controls memory but on the uP6101, FB is pin 6. I've not modded a Volterra chip with just an FB mod before. Sense+ is pin 9 and Sense- is pin 10. Volterra: uPI: I referenced these images for front and back. I have the whole datasheet for the Volterra chip and a single page for the uPI. If you need them, shoot me a PM. Quote Link to comment Share on other sites More sharing options...
nickolp1974 Posted November 8, 2015 Share Posted November 8, 2015 Thank you BP for that, after reading about it seems there's not much point overvolting the mems due to a trade off for core speed, unless anyone can tell me otherwise? Quote Link to comment Share on other sites More sharing options...
nachtfalke Posted December 19, 2015 Share Posted December 19, 2015 (edited) ddr overvolting on cypress gpu arhitecture will not help the mem overclocking at all in 90% of cases, the problem is the mem controller inside of gpu , hd 5970 use Hynix T2C ( we find that ic´s on HD5770 aswell ..and they ran with a good MC over 1500mhz.. so there are no limitation from ram aswell)they can ran at 1400+mhz without any voltage ajustament! so in all situation MC will be responsable for this..... ram vrm is also volterra in one phase for EACH gpu gpu´s regulator: VT1165mf ( conected pin9 to GND with 50ohm trimmer)drives three power MOSFETs(VT 1157SF) with a PWM signal for each GPU so you have separatly voltage control 3+3 for gpu´s...also software hack allow controll ajustament for VT1165MF without any problem ,but for me hard mod will be always best way from far.. for vmem don´t need at all a pwm chip to drivers only one phase with VT237WF integrated switching regulator 34A , 1.521v default...because it is a digital power mosfet, so that power mosfets will do alone this job als power regulator and pwm aswell! for powered uncore I/O it is also 2phase volterra with 2xVT1157SF power mosfets and one Vt1165mf pwm controller ... so in totaly we have 3 x VT1165mf pwm´s ... 2 ( 3+3 phase for each gpu)are for signal GPU regulators and another one is for uncore I/O (2 phase) for RAM we had 1+1 phase VT 237WF for each gpu , power mosfet and pwm aswell... Edited December 19, 2015 by nachtfalke 1 1 Quote Link to comment Share on other sites More sharing options...
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