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[WORKLOG] - HD3300 overclocking
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Old 26th May 2009, 08:44   #11
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Two posts I made over at XS which contain a few observations, which might come in handy some day. For reference only.

Quote:
Yes, the HT Link frequency is extremely important. Never have I seen such impressive scaling of a, at first sight, insignificant frequency. When I was benching the IGP a few weeks ago, I had a boost of 1K in 01 just by increasing the HT Link multiplier by 1.

Before you start raising the HTT frequency, please think about all the frequencies that are affected by this base clock frequency. There's a reason why I handicap myself by using the 1066MHz memory divider instead of the more performant 800MHz one. And yes, I am able to run 325MHz HTT.

I've actually thrown out my 720BE and replaced it with my 940BE because it's so bad in overclocking. 3500MHz and 2500MHz NB is just too little for this IGP ... YES, the cpu was bottlenecking me :

I'm running Ludicrous voltages on air, to be honest, but it seems that everything is running just fine, so no worries. 1.4v vHT to answer your question.

By the way, can you set the voltage of the IGP seperate from the voltage of the actual northbridge? I can't, so I always figured I was running 1.6v through the IGP, but since you're only at 1.36v and I've been reading voltages from the board that say ~1.3v I suspect the vIGP is derived from the vNB somehow on this motherboard.

http://i154.photobucket.com/albums/s...man-/29265.png

Lods actually make a giant difference with these cards. Even a small increase can make you score go up quite a bit.
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So you are running Vnb at 1.36v then? Problem is that I can only control the Vigp through the Vnb (~your setup), but the voltage of the Vnb is around 0.3v higher than the Vigp, which means I have to go up a lot in Vnb to run 1100MHz core frequency. The heat itself isn't really a problem, but I'm not sure the NB likes that much voltage ... and I still have to perform the Vnb voltage modification.

At first, I was amazed by the CPU bottleneck as well, but it actually makes a lot of sense ... we are still benching an AMD platform here :.

On AM3, it's not really that interesting to search for raw memory frequency since the platform prefers latency over bandwidth. Tony made a nice comparison in the AMD section where you can see that 1333CL5 outperforms 1600CL7. Add to that the fact it's quite difficult to get DDR3 upto 900MHz without a superior IMC on your cpu. For benching purposes, I'd stick with the 1680CL6 you have running now since it seems (at least in my tests) even more performant than 1500CL5, both bandwidth and latency-wise. Could you run an Everest benchmark for me next time you run 01? I'm pretty sure you're below 38ns latency with that configuration, which blows away my 41.3ns due to the 1066MHz memory divider.

The black slots are the ones closest to the socket? If yes, I have the same observations on my board: those furthest away provide less overclockability.

Nice 01, by the way! Looking at the subtest details, I'm trailing but quite a lot in the CL and CH tests, in spite of the 200MHz cpu advantage. It's been a while since I tweaked ATI videocards, so it's possible my tweaking is off by miles, but it's also possible the high memory latency is doing it's work (or rather: doesn't) here. Judging from the LL and LH scores that are pretty much on par (LL is equal to mine : ) I'd say the memory bandwidth is alright on this DDR2 setup. What LOD are you using for Nature? At 1140MHz core you should be over 114-115FPS.
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Old 26th May 2009, 20:36   #12
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Playing with lod at the moment.

CH-DH-LH-DL-LL-N-CL
ALL at 2.9
CL at 3.2
N at 5.7

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Old 26th May 2009, 22:42   #13
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Testing 3DMark03 again: lods of course. LOD at 2.9 gives me a bit under 9k, at 14 a bit over 9k. The boost is located in GT3, which gains about 1-2FPS. GT1 decreases by a few FPS, though (around 4FPS)

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Old 28th May 2009, 21:29   #14
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Old 28th May 2009, 21:33   #15
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1st spot reclaimed
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Old 28th May 2009, 21:59   #16
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Having an increase CPU frequency is totally pointless. The only gain is in CH (220 -> 240), but with a normal increase in GPU frequency (hello cold + volts) you could gain a lot, a lot more.
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Old 29th May 2009, 16:33   #17
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Time for finding the voltage modifications for the IGP.



AREA1



First, I measured the voltage on each pin and searched for those that change when I change the voltage in the bios:

Code:
COLOR -- HTV -- C/PCIV 1.2/1.1 -- 1.3/1.2 -- 1.34/1.44 Red = 1.14v -- 1.24v -- 1.48v Blue = 1.50v -- 1.60v -- 1.64v Yellow = 1.03v -- 1.08v -- 1.26v Green = 5.07v -- 5.07v Brown = 12v -- 12v Bordeaux = 1v -- 1v Grey = 11v -- 11v Purple = 7.65v -- 7.42v -- 6.92v


Inserting this information in a chart to see the scaling better:



Or, more mathematical, correlations:



BLUE = HT Link voltage, altough the voltage measured with a DMM = Bios value +0.3v. Not sure if this is correct.
RED = NB Core voltage, not entirely sure, but I assume the core voltage is higher than the IGP voltage
YELLOW = IGP Voltage, seems pretty correct since when I set the voltage in the bios at 1.6v, I can hit 1.1GHz core and other people do the same frequency at around 1.38v Vigp.
PURPLE = ???, no idea what this does. It scales with the NB voltage setting in the bios, though.

AREA 2:



Red spot on picture underneath is Sideport memory readout (scaling with voltage options in the bios):



AREA 3:

This chip seems to be the one that's modified on HD3xxx and HD4xxx cards to increase Vgpu, so I added it. Not sure what's it doing on the board, though ...




DATASHEET SIDEPORT: http://www.qimonda.com/download.jsp?...rev064_www.pdf
Attached Images
File Type: jpg Mobo.jpg (176.9 KB, 273 views)
File Type: jpg A1-voltages.jpg (123.3 KB, 286 views)
File Type: png voltages.png (4.6 KB, 270 views)
File Type: png volt chart.png (14.3 KB, 263 views)
File Type: png correleations.png (4.9 KB, 265 views)
File Type: jpg A2.jpg (202.5 KB, 268 views)
File Type: png A2-voltage.png (418.2 KB, 319 views)
File Type: jpg A3.jpg (125.8 KB, 268 views)
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Old 29th May 2009, 19:02   #18
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(hoping Geoffrey sees this thread)
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Old 29th May 2009, 20:42   #19
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I just did, though too informational for me to quickly read through
Any requests?
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Old 29th May 2009, 21:01   #20
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Voltage modifications. Only post #17 is FYI
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