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Help with 4290 OC

post #1 of 8
Thread Starter 
This is my first time OCing an IGP.

So I found a stable core OC of 900MHz for my Radeon HD 4290. The only problem I have now is I can't seem to change the memory clock. No matter what frequency I change it via BIOS, it still shows up as 1333MHz in Windows. Here are my BIOS settings:

IG Mode: UMA + Sideport
UMA Frame Buffer Size: 512MB
SidePort Clock Speed: 1580MHz
GFX Engine Clock: 900

SidePort Memory Voltage: 1.6



EDIT: I see advanced settings for the IG, but don't know what any of the settings are (manual gives no detail, and Google fails).
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Ol' Betsy
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post #2 of 8
IGP uses your system RAM, so the only effective way to change Vram freq on IGP is to OC the RAM.
That's the first time i hear of BIOS having a setting for Vram freq on IGP..
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post #3 of 8
Thread Starter 
IG Mode: UMA + Sideport

Meaning it is using system ram and the sideport ram.

If you Google my board, you can see it has 128MB of sideport RAM.

Even when I change the mode to sideport only, Kombustor and CCC still show the memory at stock 667MHz.

BTW, my RAM is at 1600MHz, which futher makes it confusing.
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post #4 of 8
You cant boost ram performance as it uses your system ram. There are some mobo's with onboard vram but I never heard of being able to overclock it.
post #5 of 8
Thread Starter 
Quote:
Originally Posted by CrazzyRussian View Post
You cant boost ram performance as it uses your system ram. There are some mobo's with onboard vram but I never heard of being able to overclock it.
Quote:
Originally Posted by charlie310 View Post
If you Google my board, you can see it has 128MB of sideport RAM.

Even when I change the mode to sideport only, Kombustor and CCC still show the memory at stock 667MHz.
Also, the BIOS has settings to change the sideport memory voltage and frequency (all the way up to 2000MHz). I don't know why they would do that unless you could actually OC it.

I'm thinking there is some setting in BIOS that I need to change to enable running the sideport at BIOS values.
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post #6 of 8
I would imagine it's limited to your system memory, like already stated. If you ran 2000Mhz memory, you could probably make the change. I doubt anyone has bothered to test it out, since no amount of memory bandwidth is going to improve performance on those things.
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post #7 of 8
Thread Starter 
Quote:
Originally Posted by Horsemama1956 View Post
I would imagine it's limited to your system memory, like already stated. If you ran 2000Mhz memory, you could probably make the change. I doubt anyone has bothered to test it out, since no amount of memory bandwidth is going to improve performance on those things.
System memory=800MHz. Kombustor & CCC showing GPU memory=667MHz.

I've read many reviews where they OCed the sideport memory, so people have tested it and done it.

I like how you said "no amount is of memory bandwidth is going to improve performance". It's obviously going to improve performance. Why else would I want to do it? Might not be by much, but it's obviously better than nothing.
Edited by charlie310 - 5/31/11 at 11:49am
Ol' Betsy
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Ol' Betsy
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post #8 of 8
Thread Starter 
Finally got a stable OC. Turns out that GPU-Z, Kombuster, and even CCC do not recognize this IGP correctly. And because I was only getting 10FPS in Kombuster, FPS improvement is not as evident compared to OCing a GTX 460 (where stock gives 60+ FPS).

To explain it simply, a 5% OC w/4290 will result in no FPS increase, while a 5% OC w/GTX 460 will yield 3FPS increase. That's why I mistakenly thought the memory was not OCing when it really was. It turns out Kombustor is a terrible program to use to OC the 4290 because of this. I also saw big artifacts in SC2 which did not show in Kombustor.

Anyways, here are my results for anyone who wants to OC.

Stock:
NB Volt=1.875
GPU Core=700MHz
Sideport Memory Voltage=1.5
Sideport Memory Freq=1333MHz
SC2 (1920x1080p on All Lowest Settings)= 45FPS average in beginning of game

Overclock:
NB Volt=1.2125
GPU Core=900MHz
Sideport Memory Voltage=1.6
Sideport Memory Freq=1730MHz
SC2 (1920x1080p on All Lowest Settings)= 58FPS average in beginning of game

Pretty nice performance increase of about 30%.

Not bad for a IGP. I'm sure this can play many games (on medium and low, of course).
Edited by charlie310 - 5/31/11 at 11:44pm
Ol' Betsy
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Corsair Force GT 120GB Samsung Spinpoint 320GB LiteOn DVD Burner Noctua NH-D14 (Lapped) 
CoolingCoolingOSMonitor
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Ol' Betsy
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Hard DriveHard DriveOptical DriveCooling
Corsair Force GT 120GB Samsung Spinpoint 320GB LiteOn DVD Burner Noctua NH-D14 (Lapped) 
CoolingCoolingOSMonitor
4x140mm Cooler Master R4-S4S-10AK-GP (Case Fans) Stock Case Fans: 4x120mm, 1x180mm Windows 7 Home Premium 64bit Dell ST2210B 21.5" 1080P 
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