billypnats Posted December 2, 2008 Share Posted December 2, 2008 Hi, I upgraded my ram to 2 stick 1gig 800mhz DDR2 made by Mushkin. But when I look at the speeds at BIOS it says 400mhz... why? Link to comment Share on other sites More sharing options...
bben46 Posted December 3, 2008 Share Posted December 3, 2008 Check your BIOS to see if there is a setting for that. It may be a motherboard limitation. Link to comment Share on other sites More sharing options...
billypnats Posted December 3, 2008 Author Share Posted December 3, 2008 Ah, I checked the specs and bios on my mobo (m2v-mx) and it supports up to 800mhz. I can also try to "overclock it" I changed it to 800mhz but it still shows 400mhz in CPU-Z... I'm confused Link to comment Share on other sites More sharing options...
nosisab Posted December 3, 2008 Share Posted December 3, 2008 Ah, I checked the specs and bios on my mobo (m2v-mx) and it supports up to 800mhz. I can also try to "overclock it" I changed it to 800mhz but it still shows 400mhz in CPU-Z... I'm confusedIt's alright, all speeds are based on a multiple of the machine front bus (FSB) that is respectively 100, 133. 166 or 200 MHz nominals (new moBos may go a bit more, but until last time I saw it wasn't standard yet).DDR rams runs 2 "actions" on the same FSB the former ones did. DDR2 does 4 in the same clock... and so on.For some reason your motherboard is falling back the FSB to the security speed of 100. This may be caused by wrong timings (like CAS, etc) or defective sticks. Try 665 and look if it works. Better yet, look at what speed they perform at the SPD values (Auto).You gain more if they works in dual mode than a bit quicker in single mode, too PS: this may be tricker when the RAMs aren't paired, being from the same brand and even model isn't warranty enough they will do. In this case you may try the inverse you usually does in overclocking that is reducing a bit a few timing parameters (what is to say actually increasing some of the several values) until finding the absolute maximal the slower one can perform stable. Link to comment Share on other sites More sharing options...
billypnats Posted December 3, 2008 Author Share Posted December 3, 2008 Uh... I don't get a thing you're saying...... what is timing? Can you plz explain in average joe language plz >.< EDIT: ok I went to BIOS and this is what it says about my memory settings 400MHz-5.0,6,6,18,2T MemorkCLK is 800mhz tho All options were set to autoI changed the memoryCLK to 667 went into CPUz and DRAM frequency dropped to 360.0mhz.... Im so confused =S Link to comment Share on other sites More sharing options...
nosisab Posted December 5, 2008 Share Posted December 5, 2008 Uh... I don't get a thing you're saying...... what is timing? Can you plz explain in average joe language plz >.< EDIT: ok I went to BIOS and this is what it says about my memory settings 400MHz-5.0,6,6,18,2T MemorkCLK is 800mhz tho All options were set to autoI changed the memoryCLK to 667 went into CPUz and DRAM frequency dropped to 360.0mhz.... Im so confused =SYour RAM is fine. I did download CPUZ (to confer the issue) and it reports the BUS rate that is indeed 400 MHz. You may confer it says the memory being PC2-6400 = DDR2-800 Link to comment Share on other sites More sharing options...
IamBatosai Posted December 5, 2008 Share Posted December 5, 2008 For clarification: DDR2 RAM can transfer data both on the rising and falling edge of the clock (a technique called "double pumping"). Thus meaning that while it is technically only clocked at 400 Mhz. Its effectively running at 800 Mhz. Link to comment Share on other sites More sharing options...
nosisab Posted December 5, 2008 Share Posted December 5, 2008 For clarification: DDR2 RAM can transfer data both on the rising and falling edge of the clock (a technique called "double pumping"). Thus meaning that while it is technically only clocked at 400 Mhz. Its effectively running at 800 Mhz.tks, I just realize I said his RAM is fine but forgot to say why :) (hmm, mine first post may sounds confuse, I didn't knew, before loading it, if CPUz shows the real frequency or the effective ) One useful thing that should be verified is them running in "Ganged" mod, as spelled in some MoBo, or says dual mode where the burst is 128 bits instead 64, on DDR2. If the CPUz's Memory Tab reads Chanel number "dual"; DRAM Frequency "400 MHz" FSB:DRAM 1:2 he is fine and that relation shows what happens. That better use of the clock pulse propagating from the FSB until the final "effective" clock. Link to comment Share on other sites More sharing options...
billypnats Posted December 6, 2008 Author Share Posted December 6, 2008 ok... so its actually 400mhz... does that mean that if i have DDR3 its gonna be 1.2ghz effective? Link to comment Share on other sites More sharing options...
IamBatosai Posted December 6, 2008 Share Posted December 6, 2008 No, DDR3 still only uses double pumping. And as far as I know a triple version hasn't been created yet. However though certain DDR3 modules may run at that frequency. (1066 Mhz or 1333 Mhz close enough lol) Hope this clears up that question. :smile: Anything else? :happy: Link to comment Share on other sites More sharing options...
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