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Hawaii Bios Editing ( 290 / 290X / 295X2 / 390 / 390X ) - Page 154

post #1531 of 3729
prolly lower memory controller timings
thats why we need to investigate what is memory controller settings in memory table

its not just about memory timings itself but there are also some settings for memory controller
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post #1532 of 3729
Quote:
Originally Posted by OneB1t View Post

prolly lower memory controller timings
thats why we need to investigate what is memory controller settings in memory table

its not just about memory timings itself but there are also some settings for memory controller
Yeah but I thought 390 MC timings will allow higher clocks not lower doh.gif
post #1533 of 3729
that depends on what your card manufacturer used in first place biggrin.gif
also MCU bioses are not really good overclocking bios as there is high vdrop because of lower VRM frequency
(but positive about this is that card VRM stay cooler and card efficiency is increased)
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post #1534 of 3729
Thread Starter 
@fat4l

+ rep for above info share, thanks smile.gif .

I would think this is down to varying "quality" of MC, again just "silicon lottery".

I gain performance, no clock gain AFAIK.

Fyzzz was my first participant (+rep thumb.gif), he's seen performance gains, dunno about stability. He's even done crazy bench 1320/1800 thumb.gif .

You are seeing 1625MHz 390 MC + Stock BFR Timings = 1700MHz 290 MC + Stock BFR Timings, so clear performance gain. And from my recent testing lower freq = lower power consumption(link to post), so there is efficiency via this mod in a way.

@OneB1t

My experience of 390 MC mod and how I went about it.

v0.0 circa Oct 2015 (link to posts)

I copied complete 390/X VRAM_Info (Hynix AJR) into my ROM. Added stock Hynix AFR timings and only adjusted supported memory size (80h to 40h) (not aware of density at the time). This basically was unstable at even RAM frequencies that stock factory ROM would attain, so I never checked performance. As Stilt shed no further info when I asked in linked post/thread, I abandoned project.

v1.0 circa 5 days ago (link to post)

Here I only copied what I thought is 390 MC timings into my stock AFR VRAM_Info. I saw no performance gain or stability gain.

v2.0 circa 3 days ago (no link as conducted off forum)

Here I modified 390/X VRAM_Info (Hynix AJR).

a) 80h to 40h for RAM size.
b) 53h to 43h RAM density.
c) added AFR stock timings.
d) changed RAM IC ID ie text length 0B.

This I've seen consistent small performance gain, I don't think yet gained further stability, but there is no instability gaming (4hrs) or F@H (16hrs+) (1100/1525 or 1100/1575).
Edited by gupsterg - 1/31/16 at 9:24am
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post #1535 of 3729
Quote:
Originally Posted by gupsterg View Post

@fat4l



You are seeing 1625MHz 390 MC + Stock BFR Timings = 1700MHz 290 MC + Stock BFR Timings, so clear performance gain. And from my recent testing lower freq = lower power consumption(link to post), so there is efficiency via this mod in a way.
.
Let me correct you smile.gif
1625MHz 390 MC + Stock BFR Timings = 1700MHz 290 MC + 1500 strap BFR Timings
tongue.gif

Going to mod the timings now... thumb.gif
post #1536 of 3729
yep quality of memory controller is silicon lottery again
mine is poor as my entire card :-/

if i use +100mV in afterburner my card ends somewhere about 1100mhz
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post #1537 of 3729
Thread Starter 
@fat4l

So basically 1625MHz stock BFR timings & 390 MC would be bigger gain than 1700MHz stock BFR timings & 290 MC biggrin.gif .
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post #1538 of 3729
we could see that 390X is always little faster than 290X and this difference came from MC timings / RAM timings
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post #1539 of 3729
Thread Starter 
Yeah I think so.

I was beating MSI Gaming 390X (1100/1525) with my same clocked 24/7 modded ROM (tightened RAM+290 MC) by 1-3% in limited testing I did, now I'd be clearly ahead IMO.

You may recall this thread on Guru3D, well I forgot to update it redface.gif .

When I use 390 driver path I lost points on 3dmark FS redface.gif at least 200-300, this was my modded 24/7 ROM with tightened RAM but 290 MC, I will try new 390 MC ROM as well smile.gif .
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post #1540 of 3729
i think that driver path in last drivers are same smile.gif
both using hawaii driver path
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