Ryude

I have an ECS A785GM-M motherboard and a HD 3450. (unsure which brand, but it has a 80mm fan on it)

When running in hybrid crossfire, what's the max I can overclock them to? Just the HD 4200 I can safely put it at 950mhz core. The HD 3450 I am unsure if it will go that high.

Also, what should I set the shared memory at for best performance? I don't care much about graphics, I just want to be able to play without it lagging.

the_milk_man

yea you can OC them, they might not OC as high as if they were stand alone but yes you can OC them. you might wanna put a good fan on the NB of the mobo to ffset the extra heat or even buy an aftermarket chipset cooler.

EDIT: Ok, after looking at a pic of your mobo, i would highly suggest at least zip-tying a small 40-60mm fan on your NB cooler blowing air away from your gpu

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the_milk_man

delete, double post :P

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Ryude

I have a few 80mm fans sitting around in a box of old pc stuff, I'll see if I can't rig that up somehow. Also, do you think lapping the heatsinks + replacing thermal paste would give me more peace of mind on temps or is that a waste of time?

the_milk_man

yes, replacing the thermal paste would help a bit, but try to get some arctic silver ceramique or another type of non-conductive thermal paste for the chipsets. Also, i wouldn't lap the NB cooler as it wouldn't make much of a difference, only the cpu heatsink and maybe even the processor if you want to(use IC7 diamond thermal paste for the CPU).

EDIT: i just saw that you are using a stock heatsink and the roswill case has that stock HS duct. If you wanna try for higher cpu speeds and lower temps, you could always buy an aftermarket heatsink.

Here, I found some CPU coolers that blow air downwards on the mobo and would benefit from that side air duct:

Corsair H50(I would recommend this over everything else I post)

Thermaltake MaxOrb CL-P0369 120mm CPU Cooler(I'd recommend this 2nd)

Thermaltake CLP0527 92mm CPU Cooler(3rd)

ZALMAN CNPS8700 CPU Cooler(I'd recommend this if you didn't want any of the above choices)

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Ryude

Actually that's not the system that I am using this one is AMD, the other one is Intel.

Ryude

Got some results for those interested. I was able to churn out 50+ fps in Left 4 Dead 2 @ 1680x1050 with 2xMSAA 8xAniso High Shaders the rest Medium.

Phenom II X2 550BE @ 3.5Ghz
2GB Patriot 1333
ECS A785GM-M w/ HD 4200 @ 850Mhz core/450Mhz memory
HD 3450 @ 850Mhz core/ 570Mhz memory
320GB Western Digital Caviar Blue
Cooler Master 460W power supply
Windows 7 Home Premium x86

SLeeZeY

Nice result, keep an eye/finger on your mobo though, that onboard chip will be BBQ'd if you aren't careful.

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Ryude

I put an extra fan in that blows directly on the hd 4200 heatsink. I now have the hd 4200 at 850mhz/500mhz :P

the_milk_man

you might be able to monitor the chipset temps with hwmonitor(and maybe the gpu... i can't remember)

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