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Memory and Chipsets
- Thread starter The Duke
- Start date
It's not just the chipsets that state what type of memory to use. The fsb is one important factor when deciding on what type and speed of memory is supported by any model board. You find this out by reviewing the specifications on the particular model board chosen. Different chipsets and Socket types are often seen using the same memory.
It's not just the chipsets that state what type of memory to use. The fsb is one important factor when deciding on what type and speed of memory is supported by any model board.
The motherboard would be a MSI P965 Neo F. The CPU a Core 2 Duo E6600, and the RAM would be 1GB of Kingston PC2-5300 DDR2 SDRAM (which in the product info says that it was specifically tested for Intel 925x chipsets which is why I was asking whether or not it would work with the P965 chipset. Is it just that chipset, or 925 and up?)
What is the ideal memory speed for a CPU with a FSB of 1066 MHz? (677Mhz or 533Mhz...800MHz being a bit too pricey)
Thanks,
That was the brand of memory used to test that chipset and shown to work with it. The standard memory for that model board is DDR2 800. There were two fsbs listed in the specifications seen at newegg. 1,066mhz/800mhz http://www.newegg.com/Product/Product.asp?Item=N82E16813130052
The main thing is that DDR2 800 memory would see the fsb running at 1,066mhz while DDR2 667 will see it run at 800mhz. According to the review seen at http://www.reghardware.co.uk/2006/09/20/review_msi_p965_neo-f/page2.html you can select the 667mhz for the DDR2 533 memory if needed.
The main thing is that DDR2 800 memory would see the fsb running at 1,066mhz while DDR2 667 will see it run at 800mhz. According to the review seen at http://www.reghardware.co.uk/2006/09/20/review_msi_p965_neo-f/page2.html you can select the 667mhz for the DDR2 533 memory if needed.
The main thing is that DDR2 800 memory would see the fsb running at 1,066mhz while DDR2 667 will see it run at 800mhz.
I totally didn't realize that. I thought the FSB of the CPU stayed at 1066MH/z whether one used 533MHz, 667MHz, or 800MHz. One thing that I don't get though, is: (from wikipedia)
Unlike the previous Pentium 4 and Pentium D design, the Core 2 technology sees a greater benefit from memory running synchronously with the Front Side Bus (FSB). This means that for the Conroe CPUs with FSB of 1066 MT/s, the ideal memory speed is PC2-4200. In some configurations, using PC2-5300 can actually decrease performance. Only when going to PC2-6400 is there a significant performance increase. While expensive DDR2 memory models with tighter timings do improve performance, the difference in real world games and applications is negligible.
So if, as you stated, DDR2 667 puts the FSB at 800MHz, then the PC2-4200 (DDR2 533MHz) would put the FSB at what? 667MHz, right? That doesn't really make sense though...the article is saying that a processor that is capable of 1066MHz FSB runs better at 667MHz than 800MHz (PC2 4200 being better than PC2 5300)? Is that correct or am I missing something?
How does it work with multiple sticks of memory? For instance, this motherboard while supporting 8G of memory, can only take 2G of DDR2 800. So, if you put it 2G of DDR2 800 and say 2G of DDR2 667, how does the FSB respond?
Thanks,
The thing to remember is that memory is on a separate bus from the cpu itself. How do you think they got a 1,000mhz hypertransport to work with DDR400 memory? The newer DDR2 memory doesn't work like DDR. There's no longer any double data rate seen. Instead it's based more on efficiency.
The boards supports the faster memory while running more effectively with the memory closest to the actual fsb. In the system bios the 1,066mhz is seen as 533mhz. Divide 667mhz to see 333mhz and 533mhz to see 266mhz. When mixing memory the fastest backclocks to the speed of the slower memory. The fsb would have to remain at the slower frequency there. On old boards you manually had to lower the fsb from 200mhz to 166mhz when running PC2700 dimms just to see the system even run.
In games despite having a faster cpu and memory compared to the next system the actual speed of the game itself has to be regulated or you wouldn't be able to run an older Doom II or III on a C2 system for example. The game or program would be accelerated too fast to even play. The slower memory works better by not loading the cpu faster then it can process data.
The boards supports the faster memory while running more effectively with the memory closest to the actual fsb. In the system bios the 1,066mhz is seen as 533mhz. Divide 667mhz to see 333mhz and 533mhz to see 266mhz. When mixing memory the fastest backclocks to the speed of the slower memory. The fsb would have to remain at the slower frequency there. On old boards you manually had to lower the fsb from 200mhz to 166mhz when running PC2700 dimms just to see the system even run.
In games despite having a faster cpu and memory compared to the next system the actual speed of the game itself has to be regulated or you wouldn't be able to run an older Doom II or III on a C2 system for example. The game or program would be accelerated too fast to even play. The slower memory works better by not loading the cpu faster then it can process data.