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3DMark Score Low when Running Dual Channel Help

post #1 of 7
Thread Starter 
New here, so introducing first. I'm Hellfire, real name, Colin, I've used these forums all the time but never have needed to post until now. I've been troubleshooting my rig lately just too look at different ways it performs. Before I explain my problem let me give you my system specs.

AMD X2 4800+ 2.4Ghz Per Core with Zalman Cooling
A8N32-SLI Deluxe ASUS
BFG 7950GX2
2x512MB DDR 3200
2x1GB DDR 3200
680 Watt Aspire SLI-PSU
Creative Audigy ZS
Thermaltake Armor Case

So thats my rig. I've been messing around trying different configurations. I was kinda thrown off by something today when I ran CPU-Z to just look over my hardware. My motherboard has 4 slots for RAM. I had my 2 512's in the black and blue banks on one side. Then I had the other 2 1GB's on the other side in the blue and black banks. Heres a picture of my motherboard to give a better idea http://www.overclockers.ru/images/la...a8n32sli-b.jpg With that configuration of RAM placement this is what I scored on 3dmark06.

6945 3DMarks
SM2.0 Score: 3050
HDR/SM3.0 Score: 3128
CPU Score: 1768

Thats actually pretty nice. I think. Not sure if the processor scored well. I know considering the 7950GX2 I have, thats average and just about where it should be. So back to CPU-Z. After running 3DMark06 I ran CPU-Z to check and make sure everything is where it was supposed to be. Checked the processor, looked good. Tabed to RAM and checked the information on that and was stunned to notice that my RAM was not running in dual channel. It said it was running in single channel. I wasn't too suprised because I did have them in non matching banks.

So I shut the machine off, pulled all the sticks. And set them up in matching color. So, 512's in blue and 1gb's in Black. Turned the computer on. Upon reboot. Loaded CPU-Z first to check for dual channel. It was, it was running in dual channel now. So, I loaded up 3dmark expecting to see a performance increase. Let it run. While watching it, it seemed to be running worst. So I just let it do its thing. It finished. And heres what I got running in Dual Channel!

3931 3DMarks
SM2.0 Score: 2712
HDR/SM3.0 Score: 2168
CPU Score: 522



So, benchmarking, and all this is really not my area. I know a lot about gaming in general but never have come down to troubleshooting to analyze performance. In saying that, I'm kinda confused. I mean dual channel should be improving my performance not cutting it in half. I dunno, any tips would be great. All helps. I'm just trying to optimize my machine to run the way its supposed to and I hope I learn coming out of this. Thanks ahead of time. If you need any more information about my machine let me know.
post #2 of 7
Ok Well I can suggest one reason why.

If you are using 4 Memory Modules with an AMD cpu it puts stress on the Mmeory Controller within the CPU. Thus it will hurt performance, Also it may hurt more due to the fact your stressing it at 128bit bandwidth also.

Thats just my take.
post #3 of 7
Thread Starter 
So whats your suggestion? There a settings I need to change?
post #4 of 7
There are no settings. It's just that AMD mem controllers dont like 4 sticks of RAM at the same time.
    
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CPUMotherboardGraphicsRAM
Q8400 DFI LP DK P45-T2RS eVGA GTX 650 Kingston 
Hard DriveOptical DriveOSMonitor
2.8TB Total LG Super DVD Burner SATA VII Enterprise x64 Gateway FHD2401 
PowerCaseMouseMouse Pad
Corsair VX550W NZXT Source 210 White Logitech G400 Razer Kabuto 
Audio
Creative Audigy 
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post #5 of 7
Thread Starter 
Well, I pulled the 2 512's. I'm going to run that on 3DMark and see how that goes. I would hate to think that all this time I've been bottleknecking my pc. If thats what I've been doing? But it only seemed to act up in dual channel. When I had the sticks in non matching slots with 3Gb total. It ran kinda good. But was it actually bottleknecking?
post #6 of 7
Thread Starter 
Wow! I took out the 2x512's and ran 3DMark06. So this is only 2x1GB's running in dual channel.

7582 3DMarks
SM2.0 Score: 3512
HDR/SM3.0 Score: 3387
CPU Score: 1800

Hate to know that all this time I've been bottleknecking my PC.
post #7 of 7
If I recall correctly, when you run 4 sticks over 2, you're also forced to run a 2T command rate. And also with mulitple sticks in dual channel, you have to make sure that the sticks in the channels add up properly. I think it varies by board, but it's like channel 1+3 must equal the same amount as channels 2+4. If you check your mobo manual it'll give the exact breakdowns.

Oh yeah, nice boost in performance!
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RAID0R
(14 items)
 
  
CPUMotherboardGraphicsRAM
i5 750 4.0GHz MSI P55-GD80 GTX 470 | 8800GT PhysX 2x2GB G.Skill Ripjaws 
Hard DriveOptical DriveCoolingOS
60GB Agility 2|1TB RAID0|1.5TB Pioneer DVR-217D XSPC Raystorm | XSPC RX240 Windows 7 Professional x64 
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27" Dell 2709W | 17" Samsung Logitech G15 Corsair HX850 Corsair 650D 
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Microsoft IntelliMouse 
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