AMD 64 Question

[Thoughtless] · December 21st, 2005

Hi,

I've recently installed my new AMD 64 3500+ on my mobo. There's a strange thing, which got me completely confused. The ddr clock is set to 200. My ddr memories are PC3200. Shouldnt the ddr clock be 400?

Clements · December 21st, 2005

Nope, unless you are running the CPU at half the frequency.

DDR = Double Data Rate, so 200 x 2 = 400MHz.

[Thoughtless] · December 21st, 2005

ahh so nothin is wrong with the settings. I'm running two sticks of 512MB PC3200 DDR

GCFreak · December 21st, 2005

Quote:

Originally Posted by Clements

Nope, unless you are running the CPU at half the frequency.

DDR = Double Data Rate, so 200 x 2 = 400MHz.

Ohhh, so SDR means Single Data Rate?

Clements · December 21st, 2005

Quote:

Originally Posted by GCFreak

Ohhh, so SDR means Single Data Rate?

Yes. For PC133 SD-RAM:

1 x 133 = 133MHz

**FLaRe85** · December 22nd, 2005

No, SDRAM = Synchronous Dynamic Access Memory

**refraction** · December 22nd, 2005

correct, there was no prefix before DDR as there was only 1 rate, everything ran at the set speed, as 1 read = 1hz but DDR utilised both sides of the square wave, so 1 read is done on the rising edge of the wave, and one is done as its falling, so you get 2 reads to 1hz, thats how they managed to get Double Data Rate (DDR)

but you will see even DDR is shown as say PC3200 DDR SD-Ram

Clements · December 22nd, 2005

SDR does in fact exist.

http://computing-dictionary.thefreed...+Access+Memory

I thank you.

ChankastRules · December 22nd, 2005

Quote:

Synchronous Dynamic Access Memory

Ehh, no

it's Synchronous Dynamic Random Access Memory.

**FLaRe85** · December 22nd, 2005

Quote:

Originally Posted by ChankastRules

Ehh, no

it's Synchronous Dynamic Random Access Memory.

Wow, aren't you a genius? The fact that I forgot a word doesn't really matter. The point was that the S stands for synchronous.

Clements · December 22nd, 2005

For clarification:

S stands for synchronous in SD-RAM, but not SDR, where the S stands for single.

ChankastRules · December 22nd, 2005

Quote:

Wow, aren't you a genius? The fact that I forgot a word doesn't really matter. The point was that the S stands for synchronous

I couldn't resist, because you were picking on someone else, and made a mistake

otherwise I'd never do it.

BTW Clements is right about SDR and SD-RAM they're different things.

December 21st, 2005	#1 (permalink)
[Thoughtless] 3D Gamer Join Date: Jan 2004 Location: Mars sector 11 Posts: 226	AMD 64 Question Hi, I've recently installed my new AMD 64 3500+ on my mobo. There's a strange thing, which got me completely confused. The ddr clock is set to 200. My ddr memories are PC3200. Shouldnt the ddr clock be 400?

December 21st, 2005	#2 (permalink)
Clements MMP-2 Dude Join Date: Jun 2003 Location: UK Posts: 1,633	Nope, unless you are running the CPU at half the frequency. DDR = Double Data Rate, so 200 x 2 = 400MHz. __________________ PJ64 Homepage \| ZSNES Documentation Project \| bsnes Supporter

December 22nd, 2005	#6 (permalink)
FLaRe85 I Need a Weapon Join Date: Oct 2001 Location: Omaha, NE Posts: 4,321	No, SDRAM = Synchronous Dynamic Access Memory __________________ .: Flaretech.Net :: Flaretech.Biz Web Hosting :: H3 Stats :: My Blog :. .: Mac Pro :: Dual Quad-Core Intel Xeon 5400s :: 6 GB 800MHz DDR2 ECC FB-DIMMs :: NVIDIA GeForce 8800 GT 512 MB GDDR3 :. .: Macbook Pro 17" :: 2.33 GHz Intel Core 2 Duo :: 2 GB 667 MHz DDR2 :: ATI Radeon X1600 :. .: Home Server :: 2.41 GHz AMD Opteron 180 :: 4 GB DDR400 :: Windows Server 2003 Enterprise R2 :.

December 22nd, 2005	#7 (permalink)
refraction PCSX2 Coder $refraction's Avatar$ Join Date: Jan 2004 Location: Plymouth, UK Posts: 9,819	correct, there was no prefix before DDR as there was only 1 rate, everything ran at the set speed, as 1 read = 1hz but DDR utilised both sides of the square wave, so 1 read is done on the rising edge of the wave, and one is done as its falling, so you get 2 reads to 1hz, thats how they managed to get Double Data Rate (DDR) but you will see even DDR is shown as say PC3200 DDR SD-Ram __________________ http://www.generalemu.net/ Intel Core 2 Quad Q6600 @ 3.4Ghz (425x8), Leadtek GTX 280 1Gb, 1.8Tb HDs, 2Gb Corsair DDR2-800 @ DDR2-1020 5-5-5-18 Dual Channel Dont PM me for help, use the forums, thats what its for!
$refraction is offline$

December 22nd, 2005	#8 (permalink)
Clements MMP-2 Dude Join Date: Jun 2003 Location: UK Posts: 1,633	SDR does in fact exist. http://computing-dictionary.thefreed...+Access+Memory I thank you. __________________ PJ64 Homepage \| ZSNES Documentation Project \| bsnes Supporter

December 21st, 2005	#3 (permalink)
[Thoughtless] 3D Gamer Join Date: Jan 2004 Location: Mars sector 11 Posts: 226	ahh so nothin is wrong with the settings. I'm running two sticks of 512MB PC3200 DDR

December 22nd, 2005	#11 (permalink)
Clements MMP-2 Dude Join Date: Jun 2003 Location: UK Posts: 1,633	For clarification: S stands for synchronous in SD-RAM, but not SDR, where the S stands for single. __________________ PJ64 Homepage \| ZSNES Documentation Project \| bsnes Supporter

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