My Intel Pentium II / III Slot 1 trash find motherboard collection
Could someone please explain to me how this weird combo is working in dual channel mode.
I thought modules had to be identical.
It has only 2 memory slots.
I have a 512 MB stick in 1 slot and another 1 GB stick in the other!
Even CPU-Z and Sisoft Sandra 2007 confirms this!
It's been like this since the AXP days and the first dual channel memory controller.
Matched module requirements are hardware limitations of chipsets and memory modules.
Memory controllers are driven by software, play deep sea treasure slot freebies don't need dual channel slot 1 and 3 modules, which is why this scheme works at all.
Certain Intel chipsets have a feature called flex mode,which enables to work different sized memory modules in dual channel,as in your case.
So the 512MB of 1GB module works in dual channel,rest 512 in single channel.
So you don't need matched memory modules!
Dated the beginning of 2003.
It's somewhere in that review.
The reviewer is indeed correct that dual channel does not require equal amounts of memory in both channels to operate.
Edit: In case it is not clear, I'm referring to post no.
AFAIK,there is no such thing like "flex mode" in AMD platform,Since the MC isin the uP.
Found a discussion which matches my thoughts That's slots qml and signals brand name.
We're talking about functionality.
Functionally, dual channel has never required equal amounts of memory.
You could call it 'flex' or 'neo' memory or any such thing, but this has been the truth since the nForce2 SPP.
And then, the memory controller was very much in the SPP, not the chip.
Flex dual channel slot 1 and 3 probably a reference to the fact that Intel chipsets are now flexible enough to accept different size sticks as opposed to the RAMBUS days where you had to precisely match the two channels.
That was also the origin of 'dual channel' memory kits, and Flex memory is play deep sea treasure slot freebies Intel's announcement that their chipsets do not need this now.
Physical location of the memory controller does not affect its functionality.
Here's a slightly more technical explanation.
In case of wrong installation the second memory controller might not operate.
The modules can be different as well as play deep sea treasure slot freebies producersbut their speed characteristics should be the same, otherwise the system will operate at the speed of the slower one for example, DDR266 in case of one DDR266 and one DDR400 modules.
It's also possible to use three modules, but remember that the dual-channel access can be set only for the memory size equal to the double size of the first module which is installed into the slot of the lowest numberand if the size of the first module does not exceed the sum of the sizes of the second and third modules.
Note the use of the word optimal - not dual channel slot 1 and 3 />And here's the nVidia whitepaper.
This allows asymmetric DIMMs with different memory organization, size, and speed to be used on MC1 and MC2 and still provide the full performance benefits of the 128-bit memory system Edit: Just to know that this feature also existed on X2 processors I can't find a reference for the Venice core Dual-channel controller but rest assured it was there too - you can't restrict a user to only configure their system one way!
Athlon 64 X2 processors are based on the Toledo and Manchester cores with E stepping, i.
Athlon 64 X2 also supports SSE3 instructions and features an enhanced memory controller.
Among the peculiarities of the memory controller of the new Athlon 64 X2 I would like to mention the support of different memory DIMMs in different channels it even allows installing memory modules of different apologise, pop and slot nativity scene rather in different channels and the support of up to four double-sided DIMMs in DDR400 mode.
Asus Sabertooth Z77 - 2 DIMM & RAM slots malfunctioning - By TotallydubbedHD
Alternately referred to as multi-channel memory, dual-channel memory is a DDR, DDR2, or DDR3 chipset on the motherboard providing RAM with two dedicated high-throughput data channels. The channels permit reading from and writing to memory to occur on distinct channels. To take advantage of a dual.
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