zara Posted August 26, 2013 Share Posted August 26, 2013 I know my stick of RAM has an 800MHz frequency, but Speccy only lists 400 MHz. I take it it's just halving the number. So, if I have DDR3 do I multiply the MHz by 3, and 4 for DDR4? What about RDRAM? (One of my systems has some.) Is RDRAM just the number listed? Link to comment Share on other sites More sharing options...
nodles Posted August 26, 2013 Share Posted August 26, 2013 You are probably mixing MT and MHz, check this thread: http://forum.piriform.com/index.php?showtopic=38723 Link to comment Share on other sites More sharing options...
kroozer Posted August 26, 2013 Share Posted August 26, 2013 Wiki briefly explains. Link to comment Share on other sites More sharing options...
zara Posted August 26, 2013 Author Share Posted August 26, 2013 Yeah, it looks like I am doing that. I wish manufacturers actually listed units on their products. Thanks for the help. How would I calculate the MT of RDRAM? I don't believe it is dual channel. Link to comment Share on other sites More sharing options...
kroozer Posted August 26, 2013 Share Posted August 26, 2013 How would I calculate the MT of RDRAM? I don't believe it is dual channel. http://en.wikipedia.org/wiki/RDRAM Link to comment Share on other sites More sharing options...
zara Posted August 26, 2013 Author Share Posted August 26, 2013 Yeah, I've read that. That source taken with other sources isn't exactly clear on RDRAMs transfer rate. So, again how would I calculate the MT of RDRAM? Link to comment Share on other sites More sharing options...
kroozer Posted August 26, 2013 Share Posted August 26, 2013 Type explain RDRAM into your web search engine and you'll get oodles of sites explaining enough details to make you an expert. Link to comment Share on other sites More sharing options...
zara Posted August 26, 2013 Author Share Posted August 26, 2013 They don't say it directly. Link to comment Share on other sites More sharing options...
kroozer Posted August 26, 2013 Share Posted August 26, 2013 They don't say it directly. You couldn't possibly have perused all those sites. Sorry, I'm not gonna do your homework for you. Have enough of my own. Link to comment Share on other sites More sharing options...
zara Posted August 26, 2013 Author Share Posted August 26, 2013 They're just not written very clearly and some of them have contradictory information, unlike crucial's FAQ on DDR. The best I've found is the reason for why RDRAM is no longer used, mainly a price fixing scheme from the DDR manufacturers in the early 2000's. Link to comment Share on other sites More sharing options...
zara Posted August 26, 2013 Author Share Posted August 26, 2013 At first I started to think the MHz value is just multiplied by 2 to get the data transfer rate of RDRAM, but then in the same article they mention certain RDRAM chips don't follow that rule. Namely on, PC600 RDRAM runs at 266 MHZ, while PC800 RDRAM runs at 400MHZ. PC800 RDRAM runs at a clock of 400 MHz and it uses a DDR-way of transporting the data. Thus the 16 bit or 2 Byte data are transported at 800 MHz, explaining the '800' in PC800. ....if you think that PC600 stands for 300 MHz you're dead wrong. PC600 RDRAM runs at 266 MHz Link to the article So, what's the correct formula for calculating transfer rate? Multiplying by 2 seems accurate in some cases but not all, Link to comment Share on other sites More sharing options...
Alan_B Posted August 26, 2013 Share Posted August 26, 2013 When you know the formula, how will that enhance your computer or quality of life You have linked to an article on tomshardware site. Why not ask for clarification on their forum ? http://www.tomshardw...m/forum-74.html Link to comment Share on other sites More sharing options...
zara Posted August 26, 2013 Author Share Posted August 26, 2013 I'm reselling RAM and want to make sure I have the right specs listed. Link to comment Share on other sites More sharing options...
Alan_B Posted August 27, 2013 Share Posted August 27, 2013 I suggest you specify it in the same way that it was specified by your supplier or the manufacturer. Link to comment Share on other sites More sharing options...
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