DRAM Frequency...Which is correct?

StealthTools · 10-09-2008, 06:22 PM

Does this sound right?

1.)
Divider: 1:1
FSB: 200MHz
= DRAM: 400?

Or does:

2.)
Divider 1:1
FSB: 200MHz
=DRAM: 200?

Puddle Jumper · 10-09-2008, 06:57 PM

The first one is right.

StealthTools · 10-09-2008, 07:02 PM

I have a guys program that led me to believe that #2 is correct.. I guess someone is Wrong.. :P

Puddle Jumper · 10-09-2008, 07:07 PM

With a 1:1 ratio the speed of DDR2 ram is double the fsb.

Prototype · 10-09-2008, 08:24 PM

Yes thats correct. CPU FSB is divived by 4.

zildjianchris · 10-13-2008, 02:11 AM

The first one is correct. However if your ram wasn't running in dual channel, Id be inclined to say #2 is correct also. Although I don't completely agree with it, when you run your ram in dual channel, you 'effectively' double your dram speed.
Eg.

800Mhz ram in dual channel: 800/2 = 400Mhz
800Mhz ram not in dual channel: 800/4 = 200Mhz

Im pretty sure I'm right, but by all means if it isn't right can someone please say something.

Chris

Wildside · 10-13-2008, 01:16 PM

mine says CPU/7, 1:2 ratio.

Puddle Jumper · 10-13-2008, 03:02 PM

Quote:

Originally Posted by zildjianchris

The first one is correct. However if your ram wasn't running in dual channel, Id be inclined to say #2 is correct also. Although I don't completely agree with it, when you run your ram in dual channel, you 'effectively' double your dram speed.
Eg.

800Mhz ram in dual channel: 800/2 = 400Mhz
800Mhz ram not in dual channel: 800/4 = 200Mhz

Im pretty sure I'm right, but by all means if it isn't right can someone please say something.

Chris

Don't you double the speed because its DDRx ie Double Data Rate?

zmatt · 10-20-2008, 06:43 PM

I would say #1 is correct, but it really depends on what speed you are looking at. DDR means double data rate, and the effective speed of DDR is always twice what it is really running at. have my mem and fsb at 1:1 and cpu-z lists them at the same speed, signifying that it is reading the "real" speed. The effective speed is twice that, or in my case 800mhz. I really need to up my mem, its running way under spec.

BongWizard · 10-22-2008, 06:56 AM

the first one represents FSB: DDR2... FSB: DRAM indicates the ratio of the FSB to the single sided RAM speed, but because DDR2 runs double sided, an FSB: DRAM ratio of 1:1 means that the the FSB is half of the effective RAM speed... therefore the second one is correct

but, had you changed the word "DRAM" in the first one to "DDR2" then it too would be correct

eg. an FSB of, let's say, 400MHz with a 5:6 divider (ie FSB to DRAM) would mean the DRAM frequency would be 480MHz. Assuming that this is DDR2 SDRAM, we the multiply by 2 to find the effective speed, which is, therefore, 960MHz.

10-09-2008, 06:22 PM	#1 (permalink)
StealthTools Hardware/VB.net/Anti-vir Join Date: Mar 2008 Location: NC - Intel, Sony, and NVIDIA 4 EvR! Posts: 465	DRAM Frequency...Which is correct? Does this sound right? 1.) Divider: 1:1 FSB: 200MHz = DRAM: 400? Or does: 2.) Divider 1:1 FSB: 200MHz =DRAM: 200? __________________ Knowing a little about alot never seems to help me much. Last edited by StealthTools; 10-09-2008 at 06:44 PM.

10-09-2008, 06:57 PM	#2 (permalink)
Puddle Jumper No place like 127.0.0.1 Join Date: Oct 2007 Posts: 1,874	Re: DRAM Frequency...Which is correct? The first one is right. __________________ Save Stargate Atlantis. Click here to sign the petition

10-09-2008, 07:02 PM	#3 (permalink)
StealthTools Hardware/VB.net/Anti-vir Join Date: Mar 2008 Location: NC - Intel, Sony, and NVIDIA 4 EvR! Posts: 465	Re: DRAM Frequency...Which is correct? I have a guys program that led me to believe that #2 is correct.. I guess someone is Wrong.. :P __________________ Knowing a little about alot never seems to help me much.

10-09-2008, 07:07 PM	#4 (permalink)
Puddle Jumper No place like 127.0.0.1 Join Date: Oct 2007 Posts: 1,874	Re: DRAM Frequency...Which is correct? With a 1:1 ratio the speed of DDR2 ram is double the fsb. __________________ Save Stargate Atlantis. Click here to sign the petition

10-09-2008, 08:24 PM	#5 (permalink)
Prototype Monster Techie Join Date: Mar 2008 Location: Katy, Texas Posts: 1,190	Re: DRAM Frequency...Which is correct? Yes thats correct. CPU FSB is divived by 4. __________________ Project [PROTOTYPE] BLOOMFIELD - 2009 - $3000

10-13-2008, 02:11 AM	#6 (permalink)
zildjianchris True Techie Join Date: Jun 2005 Posts: 143	Re: DRAM Frequency...Which is correct? The first one is correct. However if your ram wasn't running in dual channel, Id be inclined to say #2 is correct also. Although I don't completely agree with it, when you run your ram in dual channel, you 'effectively' double your dram speed. Eg. 800Mhz ram in dual channel: 800/2 = 400Mhz 800Mhz ram not in dual channel: 800/4 = 200Mhz Im pretty sure I'm right, but by all means if it isn't right can someone please say something. Chris __________________ The Rig: Specs e8500 @ 4.21Ghz, 4Gb OCZ Reapers @ 1108Mhz, Gainward HD 4850 GPU, Asus P5Q-PRO, Seagate 7200.11 250Gb, Corsair 620W Modular PSU, Vista Ultimate 32 (soon to be home premium 64)..... Last edited by zildjianchris; 10-13-2008 at 02:13 AM.

10-13-2008, 01:16 PM	#7 (permalink)
Wildside AMD Folding Gamer Join Date: Jan 2007 Location: Riverside, CA Posts: 2,100	Re: DRAM Frequency...Which is correct? mine says CPU/7, 1:2 ratio. __________________ Windows Vista Ultimate 32-bit - OEM APEVIA X-JUPITER G-Type X-JUPITERG-BK Black Aluminum Xclio Greatpower series 700w X14 Silent 120mm Fan Series 3GB Crucial Ballistix DDR2 800 4-4-4-12 24 2.2v @ 880, 412.5MHz 4-4-4-12-24 2.2v SAPPHIRE Radeon HD 3870 X2 PCI-E x16 w/ MX-2 AMD Athlon 64 x2 AM2 5000+ BE w/ MX-2 and Tuniq @ 3.3GHz MSI K9A2 Platinum 790FX SB600 AM2+ Seagate 3.5" 250GB SATA 3.0Gb/s 7200.10 7200 RPM Creative Sound Blaster X-Fi XtremeGamer 7.1 Channels 24-bit 96KHz Game usernames: Left 4 Dead -Steam ID xWildsidex, Crysis/Crysis Wars - Wildside, GTA4 PC - xWildsidex, for any other games PM me about

10-20-2008, 06:43 PM	#9 (permalink)
zmatt The Bulldog Join Date: Mar 2006 Location: In an empty Ramen packet Posts: 2,791	Re: DRAM Frequency...Which is correct? I would say #1 is correct, but it really depends on what speed you are looking at. DDR means double data rate, and the effective speed of DDR is always twice what it is really running at. have my mem and fsb at 1:1 and cpu-z lists them at the same speed, signifying that it is reading the "real" speed. The effective speed is twice that, or in my case 800mhz. I really need to up my mem, its running way under spec. __________________ ポップ・タルトが大好きです。 I own 2 Intels, 2 AMDs and 2 Power Pcs. Do you see a pattern? Never call me a fanboy

10-22-2008, 06:56 AM	#10 (permalink)
BongWizard Electical Engineer Join Date: Oct 2008 Location: OZ Posts: 808	Re: DRAM Frequency...Which is correct? the first one represents FSB: DDR2... FSB: DRAM indicates the ratio of the FSB to the single sided RAM speed, but because DDR2 runs double sided, an FSB: DRAM ratio of 1:1 means that the the FSB is half of the effective RAM speed... therefore the second one is correct but, had you changed the word "DRAM" in the first one to "DDR2" then it too would be correct eg. an FSB of, let's say, 400MHz with a 5:6 divider (ie FSB to DRAM) would mean the DRAM frequency would be 480MHz. Assuming that this is DDR2 SDRAM, we the multiply by 2 to find the effective speed, which is, therefore, 960MHz. __________________ NZXT Lexa BlackLine w/ Red LEDs \| Corsair TX-750 \| Gigabyte EP45-DS3P \| Intel Core 2 Quad Q9300 @ 3.6GHz 2x 2GB Kingston HyperX PC2-6400 @ 960MHz (5-4-4-13) \| 3x Seagate Barracuda 7200.11 500GB HDD in RAID5 2x HIS Radeon HD 4850 @ 761/1103 in CrossFireX w/ Thermaltake DuOrbs \| Creative X-Fi XtremeGamer Fatal1ty Pro Got a problem?? Click Here before posting! Last edited by BongWizard; 10-22-2008 at 06:59 AM.

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