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post #1701 of 4141
Thread Starter 
I know its been said before, but Ive been doing some testing and just wanted to share my thoughts in regards to overclocking on the RX 470


So alot of people like to use kombustor, furmark, and OCCT to test there GPU for stability and I have to say this is a rather awful idea on something like the RX 470, really any card but this one in particular.

The RX 470 being a 4 phase design (with varying peak current depending on the model) and having similar power usages characteristics to is a littler bit more limited than the RX 480 in peak power usage when it comes to overclocking and ASIC of 80% and higher seem to be able to push the limits of the RX470 power delivery. Ive been working to try and push my GPU to 1375mhz at 1.15v or less as I know i cannot keep within limits at 1.2v without tripping over current and forcing a system shutdown.

Running OCCT even at a seemingly low 5 FPS can cause major spikes in power usage on your card, mine seeing 230a+/250w+ at 1.15v that while ok for momentary spikes for benching this is not ideal. Under normal conditions running a heaven loop for 1hr the card never spikes beyond 180a (averaging around 100-115 same settings as occt test).

In short, if youre overclocking the RX 470 and testing for stability just plain dont use kombustor/furmark/OCCT. The stock settings should handle it just fine but pushing for 1.4ghz and higher voltage its best not to.

on the 470 for overclocking be aware of

1. Your Leakage/ASIC , lower is better for current draw and max safe voltage
2. What VRMs you have, all are not created equal and to push your cards limits you need to know what they are

edit: oh and last thing, tightening your timings provides higher benefit than overclocking the ram on the 4gb RX 470, you likely wont get much outta the ram (1900mhz if youre decently lucky) and 1750mhz at tighter timings can equal 1900mhz
Edited by Echoa - 9/30/16 at 1:32am
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post #1702 of 4141
Quote:
Originally Posted by Echoa View Post

I know its been said before, but Ive been doing some testing and just wanted to share my thoughts in regards to overclocking on the RX 470


So alot of people like to use kombustor, furmark, and OCCT to test there GPU for stability and I have to say this is a rather awful idea on something like the RX 470, really any card but this one in particular.

The RX 470 being a 4 phase design (with varying peak current depending on the model) and having similar power usages characteristics to is a littler bit more limited than the RX 480 in peak power usage when it comes to overclocking and ASIC of 80% and higher seem to be able to push the limits of the RX470 power delivery. Ive been working to try and push my GPU to 1375mhz at 1.15v or less as I know i cannot keep within limits at 1.2v without tripping over current and forcing a system shutdown.

Running OCCT even at a seemingly low 5 FPS can cause major spikes in power usage on your card, mine seeing 230a+/250w+ at 1.15v that while ok for momentary spikes for benching this is not ideal. Under normal conditions running a heaven loop for 1hr the card never spikes beyond 180a (averaging around 100-115 same settings as occt test).

In short, if youre overclocking the RX 470 and testing for stability just plain dont use kombustor/furmark/OCCT. The stock settings should handle it just fine but pushing for 1.4ghz and higher voltage its best not to.

on the 470 for overclocking be aware of

1. Your Leakage/ASIC , lower is better for current draw and max safe voltage
2. What VRMs you have, all are not created equal and to push your cards limits you need to know what they are

To add to this fine warning, 3DMark now has quite a decent stability test suite, you guys should try it out, it's not the standard benchmarks, but a loop specifically designed to test stability w/o frying your VRM.
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post #1703 of 4141
I never EVER use those power virus program such as OCCT, Furmark, Kombustor or whatever. Even buying second hand card I would avoid people who test their card with these programs. Like ronnin said it's better to use the new 3DMark stability test suite, or just run whatever the most demanding games you have.
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post #1704 of 4141
Sorry if this has been said already, does anybody know what MOSFETS does Sapphire 480 Nitro uses?
And Sapphire 470 Platinum, if anyone knows smile.gif

Thanks!
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post #1705 of 4141
Kitguru and Hexus has close up pictures. Or other sites and reviews might have mentioned the precise names.
post #1706 of 4141
Thread Starter 
Quote:
Originally Posted by JackCY View Post

Kitguru and Hexus has close up pictures. Or other sites and reviews might have mentioned the precise names.

The mosfets are blurred to hell in their pictures.

@ronnin426850 they look to use the ir3551. I'll let you know exactly when I get new thermal pads and disassemble my nitro 470 which uses the same just 2 less. It's definitely IR stages though, should be able to do 300a constant up to 125c

Platinum 470 looks to be reference 480 VRMs - 2 so 160A @100c, 215a 70c, 240a 30c

edit: maths
Edited by Echoa - 9/30/16 at 11:18am
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post #1707 of 4141
Quote:
Originally Posted by Echoa View Post

The mosfets are blurred to hell in their pictures.

@ronnin426850 they look to use the ir3551. I'll let you know exactly when I get new thermal pads and disassemble my nitro 470 which uses the same just 2 less. It's definitely IR stages though, should be able to do 300a constant up to 125c

Platinum 470 looks to be reference 480 VRMs - 2 so 180A @100c, 215a 70c, 240a 30c

Thank you! Repped smile.gif
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post #1708 of 4141
Quote:
Originally Posted by Echoa View Post

The mosfets are blurred to hell in their pictures.

@ronnin426850 they look to use the ir3551. I'll let you know exactly when I get new thermal pads and disassemble my nitro 470 which uses the same just 2 less. It's definitely IR stages though, should be able to do 300a constant up to 125c

Platinum 470 looks to be reference 480 VRMs - 2 so 160A @100c, 215a 70c, 240a 30c

edit: maths

High or low side for those figures?

Ive pushed ~200w with VRM temps around 95c, which should be right at 160A @ 1.2v. No issues so far. Not going to complain much either if thats the limit, was running 1400 core to get that kind of amp load.
Edited by KarathKasun - 9/30/16 at 12:46pm
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post #1709 of 4141
Thread Starter 
Quote:
Originally Posted by KarathKasun View Post

High or low side for those figures?

Ive pushed ~200w with VRM temps around 95c, which should be right at 160A @ 1.2v. No issues so far. Not going to complain much either if thats the limit, was running 1400 core to get that kind of amp load.

the Nitro (and Strix) dont have high side theyre combined power IR stages which do 50a(60a for Strix) (75a for burst current or 450a total) at any temp less than 125c, the platinum those are the high side with the low side rated for like 400a which is rated at that for transient current loads but for constant current I use the high side as the base mark. You will have some flexibility as theyre just rough numbers and not absolutes. I dont know the in and out of the entire power circuit so any numbers i can google are simply rough estimates

Gigabyte and Power Color actually have lower tolerance
Edited by Echoa - 9/30/16 at 1:03pm
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post #1710 of 4141
From what I know of VRM design, the high side should handle quite a bit more than it is specced for unless you are running very high vcore. Mainly because they are not running anywhere near 100% duty cycle.
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