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Is it worth upgrading my mobo for better FPS performance?

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September 2, 2009 8:42:51 PM

I’d like to see a bit better performace in my 1st person shooters. Should I upgrade my mobo to an Asus Crosshair III with a 790FX chipset and dual x16 PCIe support? My current board has a 790GX chipset and only dual x8 PCIe support.

System specs:

CPU: AMD Phenom II X3 720 - OC’ed to 3.5 GHz
Graphics: (2) Sapphire HD4870’s (1 Gb ea.) in CrossfireX - OC’ed
Mobo: Asus M4A78T-E – AMD 790GX / SB750
RAM: G.Skill 8 Gb - DDR3 1333 MHz
HDD: WD Caviar Black 750 Gb – 7200 rpm / 32 Mb cache
PSU: PC Power & Cooling Silencer 610
CPU Cooler: Xigmatek S1283 w/ 120mm Fan
Case Fans: (4) Scythe 120mm’s & (1) Antec 200mm
OS: Windows 7 Home Premium 64-bit
Monitor: 40” Samsung LCD TV (LN40B640) @ 1920x1080 res.
September 2, 2009 8:51:14 PM

I don't think you would notice any difference between the two boards with this setup. Maybe %2 !?
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September 2, 2009 9:29:33 PM

soo-nah-mee said:
I’d like to see a bit better performace in my 1st person shooters. Should I upgrade my mobo to an Asus Crosshair III with a 790FX chipset and dual x16 PCIe support? My current board has a 790GX chipset and only dual x8 PCIe support.

System specs:

CPU: AMD Phenom II X3 720 - OC’ed to 3.5 GHz
Graphics: (2) Sapphire HD4870’s (1 Gb ea.) in CrossfireX - OC’ed
Mobo: Asus M4A78T-E – AMD 790GX / SB750
RAM: G.Skill 8 Gb - DDR3 1333 MHz
HDD: WD Caviar Black 750 Gb – 7200 rpm / 32 Mb cache
PSU: PC Power & Cooling Silencer 610
CPU Cooler: Xigmatek S1283 w/ 120mm Fan
Case Fans: (4) Scythe 120mm’s & (1) Antec 200mm
OS: Windows 7 Home Premium 64-bit
Monitor: 40” Samsung LCD TV (LN40B640) @ 1920x1080 res.


All your stuff looks pretty powerful; I don't think the 8x slots would limit all that much.

However, your "monitor" stood out to me. If you are experiencing what you think is bad framerate, it could simply be input lag and ghosting from that TV. Just because it's LCD and Samsung doesn't automatically mean it's good gaming stuff. Try hooking your rig up to a high res CRT if you can find one and see if there's any noticeable difference.

Also, since you've overclocked your proc, check its temps during gaming with coretemp or something. It could conceivably be throttling down due to temps. It is summer :) 

One last question: what games, specifically? Some, like Crysis, are known to be biased against crossfire, and scale better in SLI, which could be the cause of the lackluster performance.
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September 2, 2009 10:13:14 PM

Nope. The performance would only improve like a max of 5% but in most cases the difference would be much lower or none at all. If you need more performance I guess you could try unlocking the 4th core or something. If you switch to water cooling you will be able to push that CPU a little more.
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September 2, 2009 11:59:54 PM

I'd be more inclined to suspect a CPU bottleneck. Maybe get a X4 CPU, and see if that makes a visible difference.
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September 3, 2009 12:21:20 AM

You are at the minimum wattage for your Xfire. Would that effect your setup?
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