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Hardware Forum / PC Hardware / Homebuilt PC / September 2007Dual Channel Memory Mode?
Hi, My motherboard is an Asus P5N32-SLI SE Deluxe and I have two matched 1-gig memory modules (Corsair TWIN2X2048-6400C4). The memory is set at 4-4-4-12-2T Cas 4, running at 2.1v, and posts at 800mhz. The motherboard has four DIMM slots, A1 and A2 are grouped into Channel A, and B1 and B2 are grouped into Channel B. I have my two memory modules in A1 and A2. How can I tell if the memory is running in dual channel mode? If its not, do I need to try a different memory configuration? (i.e. A1 B1). My system has run rock solid for 9 months without a problem. I just want to get the maximum performance out of it. > Hi, > [quoted text clipped - 13 lines] > My system has run rock solid for 9 months without a problem. I just > want to get the maximum performance out of it. Usually it'll tell you in POST if you've not got the splash screen enabled. Alternatively, run the Memory Benchmark in SiSoft Sandra with the DIMMS in different slots, i.e A1/2 and A1/B1.  SignatureConor I'm not prejudiced. I hate everyone equally. >Usually it'll tell you in POST if you've not got the splash screen >enabled. > >Alternatively, run the Memory Benchmark in SiSoft Sandra with the DIMMS >in different slots, i.e A1/2 and A1/B1. Hi Conor, thank you for the info. I tried Sandra and got a memory bandwidth of about 3.2 gigs. Then I reconfigured the memory from A1/A2 to A1/B1 and there was a new POST message about dual channel mode enabled. Sandra showed a definite improvement of about 5.8 gigs. I can't believe I went all this time without realizing that dual channel relied on memory placement. Ah well, we live and we learn. Ty again for your reply. > Hi Conor, thank you for the info. I tried Sandra and got a memory > bandwidth of about 3.2 gigs. Then I reconfigured the memory from > A1/A2 to A1/B1 and there was a new POST message about dual channel > mode enabled. Sandra showed a definite improvement of about 5.8 gigs. Git. > I can't believe I went all this time without realizing that dual > channel relied on memory placement. Ah well, we live and we learn. Ty > again for your reply. I only get around 3.2Gb/s in dual channel... SignatureConor I'm not prejudiced. I hate everyone equally. >> Hi Conor, thank you for the info. I tried Sandra and got a memory >> bandwidth of about 3.2 gigs. Then I reconfigured the memory from [quoted text clipped - 8 lines] >> >I only get around 3.2Gb/s in dual channel... My motherboard autodetected my memory settings incorrectly, which is either a quirk with my motherboard or my memory. But the msg boards on the website where I bought my hardware stated that this is normal and that the correct memory settings must be entered manually, which wasn't a problem. The optimal settings for my own memory are 4-4-4-12 CAS 4 @ 2.1v. Try researching for the optimal settings for your memory and checking your bios to see if its correct. > >> Hi Conor, thank you for the info. I tried Sandra and got a memory > >> bandwidth of about 3.2 gigs. Then I reconfigured the memory from [quoted text clipped - 16 lines] > CAS 4 @ 2.1v. Try researching for the optimal settings for your > memory and checking your bios to see if its correct. Sadly, I have. SignatureConor I'm not prejudiced. I hate everyone equally. It is already set up fine. Your system cannot TELL you that it is running in dual channel mode. You just have to have set it up correctly to start with. Signature--------------------- DaveW --------------------- > Hi, > [quoted text clipped - 13 lines] > My system has run rock solid for 9 months without a problem. I just > want to get the maximum performance out of it. > It is already set up fine. Your system cannot TELL you that it is running > in dual channel mode. You just have to have set it up correctly to start > with. But it can. BIOS probes the memory modules on start, and programs the memory controller to run single or dual. Usually the mode is displayed during the POST cpu-z can also tell which mode you're running >> It is already set up fine. Your system cannot TELL you that it is running >> in dual channel mode. You just have to have set it up correctly to start [quoted text clipped - 5 lines] > >cpu-z can also tell which mode you're running Yes, we have to wonder where DaveW gets this stuff sometimes. >>> It is already set up fine. Your system cannot TELL you that it is >>> running [quoted text clipped - 10 lines] > Yes, we have to wonder where DaveW gets this stuff > sometimes. I think he just sits all day and makes the sh&$ up.........:-) Ed > It is already set up fine. Your system cannot TELL you that it is running > in dual channel mode. Rubbish. Mine does in POST. SignatureConor I'm not prejudiced. I hate everyone equally. |
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