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Re: Computer trouble [message #185043 is a reply to message #185015]

Sun, 08 January 2006 04:29

Scythar
Messages: 580
Registered: February 2003
Location: Finland

Karma:

Colonel

icedog90 wrote on Sat, 07 January 2006 21:52

Scythar wrote on Fri, 06 January 2006 18:32

icedog90 wrote on Fri, 06 January 2006 15:56

Scythar wrote on Fri, 06 January 2006 12:25

icedog90 wrote on Fri, 06 January 2006 14:53

Dual channel isn't a certain type of memory, it's two sticks of DDR that are both exactly the same and are being effectively doubled in bandwidth from the RAM to the CPU.

http://en.wikipedia.org/wiki/Dual_channel

Actually, the bandwidth is only doubled between the RAM and memory controller. There's still only one frontside bus (between CPU and chipset), which is exactly why dual channel doesn't bring such a huge performance increase in AMD chips than Intel, since AMD doesn't have as fast FSB and it creates a bottleneck. Intel's fast 800 Mhz(= 2x DDR400 speed) is great for dual channel arcitechture.

I knew someone would jump in and attempt to correct me because I said "bandwidth". I was talking about the bits, not the actual bandwidth. Utilizing two 64-bit channels, it results in a total bandwidth of 128 bits for moving from the RAM to the CPU.

There isn't a straight databus between RAM and CPU, it all goes through the chipset.

The problem is that the FSB(CPU<->chipset) is only 64-bit, so the uber1337 2x64-bit dual channel memory(Chipset<->RAM) bus can't fit through the FSB, causing a bottleneck, and nowhere near 2x transfer rates.

This is becoming obsolete info when 128-bit FSB is becoming more common or there's some other new tech stuff involved, but anyone with Athlon XP-family CPU, for example, will not benefit all that much from dual channel.

Now you're going into another topic...

No I'm not Rocked Over

I just made it clear that dual channel architecture doesn't automatically double the bits to 128 between RAM and CPU, just RAM and memory contrtoller, as I've said about three times now Razz

Whether there's actually a FSB fast enough to take advantage of that, shouldn't be taken for granted. (Ahtlon XP)

But hey, we're hijacking this...

There's a hole in the sky through which things can fly.

[Updated on: Sun, 08 January 2006 04:30]

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[Message index]

		Computer trouble By: Kanezor on Thu, 05 January 2006 06:17
		Re: Computer trouble By: Sir Phoenixx on Thu, 05 January 2006 06:54
		Re: Computer trouble By: Kanezor on Thu, 05 January 2006 09:27
		Re: Computer trouble By: Aprime on Thu, 05 January 2006 07:12
		Re: Computer trouble By: Mindtzar on Thu, 05 January 2006 07:35
		Re: Computer trouble By: SCOTT9 on Thu, 05 January 2006 08:05
		Re: Computer trouble By: PaRaDoX on Thu, 05 January 2006 11:25
		Re: Computer trouble By: icedog90 on Thu, 05 January 2006 11:30
		Re: Computer trouble By: Kanezor on Thu, 05 January 2006 12:12
		Re: Computer trouble By: icedog90 on Thu, 05 January 2006 12:22
		Re: Computer trouble By: trooprm02 on Thu, 05 January 2006 13:57
		Re: Computer trouble By: icedog90 on Thu, 05 January 2006 15:52
		Re: Computer trouble By: trooprm02 on Sun, 08 January 2006 12:36
		Re: Computer trouble By: bigwig992 on Thu, 05 January 2006 21:09
		Re: Computer trouble By: light on Thu, 05 January 2006 23:03
		Re: Computer trouble By: ssptweek on Fri, 06 January 2006 00:29
		Re: Computer trouble By: Scythar on Fri, 06 January 2006 05:09
		Re: Computer trouble By: mision08 on Fri, 06 January 2006 06:39
		Re: Computer trouble By: Kanezor on Fri, 06 January 2006 12:37
		Re: Computer trouble By: icedog90 on Fri, 06 January 2006 12:53
		Re: Computer trouble By: Scythar on Fri, 06 January 2006 13:25
		Re: Computer trouble By: icedog90 on Fri, 06 January 2006 13:56
		Re: Computer trouble By: Scythar on Fri, 06 January 2006 19:32
		Re: Computer trouble By: icedog90 on Sat, 07 January 2006 19:52
		Re: Computer trouble By: Scythar on Sun, 08 January 2006 04:29
		Re: Computer trouble By: mision08 on Sat, 07 January 2006 01:09
		Re: Computer trouble By: Aprime on Sat, 07 January 2006 02:56
		Re: Computer trouble By: Kanezor on Sat, 07 January 2006 03:16
		Re: Computer trouble By: PackHunter on Sat, 07 January 2006 05:15
		Re: Computer trouble By: Aprime on Sat, 07 January 2006 07:51
		Re: Computer trouble By: Renx on Sat, 07 January 2006 10:14
		Re: Computer trouble By: SCOTT9 on Sat, 07 January 2006 11:55
		Re: Computer trouble By: PaRaDoX on Sat, 07 January 2006 12:46
		Re: Computer trouble By: mision08 on Sat, 07 January 2006 14:46
		Re: Computer trouble By: Aprime on Sat, 07 January 2006 21:59
		Re: Computer trouble By: Nineball on Sun, 08 January 2006 13:55
		Re: Computer trouble By: mision08 on Sun, 08 January 2006 15:31
		Re: Computer trouble By: Renx on Sun, 08 January 2006 20:54
		Re: Computer trouble By: Aprime on Sun, 08 January 2006 21:54
		Re: Computer trouble By: Nineball on Mon, 09 January 2006 03:47
		Re: Computer trouble By: mision08 on Mon, 09 January 2006 08:27
		Re: Computer trouble By: Nineball on Tue, 10 January 2006 23:42

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