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Polaris RX 480 / RX 470 / RX 460 Discussion Thread - Page 73  

post #721 of 991
Nitro has dual bios biggrin.gif (now we just need drivers to stop checking bios signature rolleyes.gif).





XFX DD dual bios as well smile.gif .





Looks like they have gone 6 phase GPU VRM like ref PCB (IRF 6894/6811 DirecFET) biggrin.gif .





I must resist the temptation of AIB RX 480s tongue.gif .
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post #722 of 991
Quote:
Originally Posted by gupsterg View Post

Nitro has dual bios biggrin.gif (now we just need drivers to stop checking bios signature rolleyes.gif).





XFX DD dual bios as well smile.gif .





Looks like they have gone 6 phase GPU VRM like ref PCB (IRF 6894/6811 DirecFET) biggrin.gif .





I must resist the temptation of AIB RX 480s tongue.gif .

no reason to do more than six imo, 6 phases is more than enough for a 480 and a good OC on it

(its kinda overkill like my 270x with 6+2phase)
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post #723 of 991
I agree no need to go over 6 phases for OC'ing smile.gif , just like that they are doing same as ref PCB wink.gif .

MSI custom PCB RX 480 = 4 phases IIRC, a card I may not consider to buy, not that it may hamper OC potential but more phases = more components to distribute power = lower temps as each phase/component carry lower load from total load being placed.

I had a Vapor-X 290X which on the rear had 10 phases and when compared with Tri-X (ref PCB 6 rear) and Asus DCUII the temps where crazy low, even though on air. IIRC approx. 60C with 1100/1525 @ 1.3V VID via ROM. Where as on Tri-X / DCUII you would see easily 80-90C, also the Vapor-X 290X had doubled phase at front of PCB again crazy low temps when compared with Tri-X/DCUII.

Cooler VRM = better efficiency, etc.
Edited by gupsterg - 7/17/16 at 11:09am
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post #724 of 991
Quote:
Originally Posted by gupsterg View Post

I agree no need to go over 6 phases for OC'ing smile.gif , just like that they are doing same as ref PCB wink.gif .

MSI custom PCB RX 480 = 4 phases IIRC, a card I may not consider to buy, not that it may hamper OC potential but more phases = more components to distribute power = lower temps as each phase/component carry lower load from total load being placed.

I had a Vapor-X 290X which on the rear had 10 phases and when compared with Tri-X (ref PCB 6 rear) and Asus DCUII the temps where crazy low, even though on air. IIRC approx. 60C with 1100/1525 @ 1.3V VID via ROM. Where as on Tri-X / DCUII you would see easily 80-90C, also the Vapor-X 290X had doubled phase at front of PCB again crazy low temps when compared with Tri-X/DCUII.

Cooler VRM = better efficiency, etc.

Wrong! MSI has the same phases as ref. Look closer for PCB. Free places is for two more phases so PCB is ready for 6+2 (not like 4+2 as ref.)
Phases for mem and vref is on the left side chip.

post #725 of 991
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post #726 of 991
Quote:
Originally Posted by JackCY View Post

Yeah tell me, I'm in endless ASUS 280x RMA, waiting for any decent new GPU around $200-250 to be available. Decent = nonreference cooler and good enough power delivery. If ASUS sends me a DOA card from RMA the 2nd time I'm gonna start taking hostages.

#1 reason to avoid ASUS
Quote:
Originally Posted by zdziseq View Post

Wrong! MSI has the same phases as ref. Look closer for PCB. Free places is for two more phases so PCB is ready for 6+2 (not like 4+2 as ref.)
Phases for mem and vref is on the left side chip.


Actually he is right. Reference is 6+1, msi gaming "x" version is 4+2, so unless they release a gaming Z version the msi aib cardsare going to have hotter and less efficient power delivery.

The nitro and Xfx boards are looking to be the best so far; no shots of the devil 13 pcb and asus pretty much never delivers for amd cards.
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post #727 of 991
Quote:
Originally Posted by zdziseq View Post

Wrong! MSI has the same phases as ref. Look closer for PCB. Free places is for two more phases so PCB is ready for 6+2 (not like 4+2 as ref.)
Phases for mem and vref is on the left side chip.


i was under the impression that the ref was 6+1 (6 GPU + 1 for mem/link)

6 is more than enough for a 480, hell 6 was the ref 290/390 setup

edit: Im sorry sir but you are incorrect (ik wcc link, but still shows the intended info) http://wccftech.com/amd-rx-480-pcie-power-issue-detailed-overclocking-investigated/

the power delivery on an rx 480 is 6+1 phases, has 1 phase less than the 6+2 phase my 290 thats coming in the mail


msi shouldve just stuck to ref design instead of cutting corners
Edited by Echoa - 7/17/16 at 1:00pm
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post #728 of 991
Quote:
Originally Posted by Echoa View Post

i was under the impression that the ref was 6+1 (6 GPU + 1 for mem/link)

6 is more than enough for a 480, hell 6 was the ref 290/390 setup

edit: Im sorry sir but you are incorrect (ik wcc link, but still shows the intended info) http://wccftech.com/amd-rx-480-pcie-power-issue-detailed-overclocking-investigated/

the power delivery on an rx 480 is 6+1 phases, has 1 phase less than the 6+2 phase my 290 thats coming in the mail


msi shouldve just stuck to ref design instead of cutting corners

i'm sorry but where is that +1 phase in ref PCB? I see only 6 phases (gpu4+2mem/link)
post #729 of 991
Quote:
Originally Posted by zdziseq View Post

i'm sorry but where is that +1 phase in ref PCB? I see only 6 phases (gpu4+2mem/link)
Quote:
Originally Posted by I-o-I View Post

thanks for the reply thumb.gif
Yes, I understand those basics.
However, Igor from Tom's Hardware deduced that actually 4 phases are connected to the slot and only 2(+1) to the 6-pin connector.

source (sorry, German): http://www.tomshardware.de/amd-radeon-rx-480-grafikkarte-leistungsaufnahme-pci-sig,testberichte-242143.html

This makes more sense, too, imho, when you say "each of the VRM phases handle the same amount of load", looking at the measured total power consumption. How can you be sure the balance is actually 50/50? I'm not trying to take a swipe at you, just trying to understand.
Also, how did you validate those results? Do you have equipment to measure the draw from PEG/PCIe 6 Pin?
Yes, I thought that. But what I was searching for (out of curiosity) is what do the exact parameters mean? And how is the exact load distribution between the phases when choosing values from B to F. Can you split the command value and explain the single bits?

6 to GPU power plane, +1 for memory/link voltage
Edited by Echoa - 7/17/16 at 1:14pm
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post #730 of 991
Quote:
Originally Posted by Echoa View Post

i was under the impression that the ref was 6+1 (6 GPU + 1 for mem/link)

6 is more than enough for a 480, hell 6 was the ref 290/390 setup

edit: Im sorry sir but you are incorrect (ik wcc link, but still shows the intended info) http://wccftech.com/amd-rx-480-pcie-power-issue-detailed-overclocking-investigated/

the power delivery on an rx 480 is 6+1 phases, has 1 phase less than the 6+2 phase my 290 thats coming in the mail


msi shouldve just stuck to ref design instead of cutting corners

i'm sorry but where is that +1 phase in ref PCB? I see only 6 phases (gpu4+2mem/link)
Quote:
Originally Posted by Echoa View Post


6 to GPU power plane, +1 for memory/link voltage

I think MSi decided to do not use PCIE power so they dont use that thing on right. And as you see its not even mark as phase +1/

Time will tell thumb.gif
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