Why is a 1:1 FSB/RAM ratio better?

michaelmcgo · 03-19-2008, 01:17 PM

I am trying to OC my E2180 to 3.2 Ghz (400x8) so that my FSB is in a 1:1 ratio with my DDR2 800 RAM. I've heard this is a good thing, why?

Kornowski · 03-19-2008, 01:29 PM

Having your ratio at 1:1 is a good thing because it saves your RAM speed going through the roof when you're OC'ing your CPU...

It basically halves your RAM speed, so that as you OC your CPU, you start to bring the RAM back up to it's default speed...

[-0MEGA-] · 03-19-2008, 01:32 PM

It is a good thing, but Danny he's asking why a 1:1 ratio gives you better performance.

Sorry, I don't have an answer to your question,

Kornowski · 03-19-2008, 01:35 PM

Quote:

Originally Posted by [-0MEGA-]

It is a good thing, but Danny he's asking why a 1:1 ratio gives you better performance.

Sorry, I don't have an answer to your question,

I thought he was just asking why it's good, he doesn't mention performance...

nffc10 · 03-19-2008, 01:55 PM

I've been told it's like this:

If you have a one lane road from the CPU to the RAM and a one lane road from the RAM to the CPU (1:1) theres less chance of a backlog in traffic (data).
Whereas if you have a 2 lane road from the CPU to the RAM and a one lane road from the RAM to the CPU then there's going to be more traffic going into the RAM than the road out (to the CPU) can hold. That will cause a backlog in data and result in lower performance.

That's just an idea.

michaelmcgo · 03-19-2008, 02:29 PM

I was wondering about performance.

Currently I am running my CPU at 3.0 Ghz (333x9), with a 1:2.4 Ratio.

I was wondering how much better performance I'd get with my ratio at 1:1 (FSB at 400). Same RAM speed, different ratio.

**Cromewell** · 03-19-2008, 02:48 PM

I don't know what the exact difference would be. But as to why 1:1 is better, nffc10 is right, all the clocks line up instead of having to wait at one end or the other.

**mep916** · 03-19-2008, 02:55 PM

Quote:

Originally Posted by nffc10

I've been told it's like this:

If you have a one lane road from the CPU to the RAM and a one lane road from the RAM to the CPU (1:1) theres less chance of a backlog in traffic (data).
Whereas if you have a 2 lane road from the CPU to the RAM and a one lane road from the RAM to the CPU then there's going to be more traffic going into the RAM than the road out (to the CPU) can hold. That will cause a backlog in data and result in lower performance.

That's just an idea.

Thanks for clearing that up.

michaelmcgo · 03-19-2008, 03:05 PM

Is there a performance comparison anybody knows about between 1:1 and not 1:1?

Has anyone tried both setups and noticed a difference?

[-0MEGA-] · 03-19-2008, 04:28 PM

Quote:

Originally Posted by michaelmcgo

Is there a performance comparison anybody knows about between 1:1 and not 1:1?

Has anyone tried both setups and noticed a difference?

I've ran memory bandwidth benchmarks doing that and the 1:1 ratio always was better except for when the memory speed what significantly faster in a non 1:1 ratio.

03-19-2008, 01:17 PM	#1 (permalink)
michaelmcgo Bronze Member Join Date: Dec 2007 Posts: 92	Why is a 1:1 FSB/RAM ratio better? I am trying to OC my E2180 to 3.2 Ghz (400x8) so that my FSB is in a 1:1 ratio with my DDR2 800 RAM. I've heard this is a good thing, why? __________________ My current computer: CPU: Intel E2180 @3.0 Ghz 24/7 cooled with Freezer 7 Pro GPU: MSI 8800GT 512MB OCed to 700 core/ 1750 Shaders / 2000 Mem MOBO: Gigabyte GA-P35-DS3L v2.0 RAM: 2GB G.Skill DDR2 800 running at 1066Mhz (5,5,5,12) Hard Drive: Seagate Barracuda 250GB 7,200rpm Monitor: 22" widescreen Envision LCD Speakers: Logitech 2.1 w/ 8" sub OS: Vista Premium 32 Bit

03-19-2008, 01:29 PM	#2 (permalink)
Kornowski VIP - Graphics Guru Join Date: Jul 2006 Location: Liverpool, UK Age: 18 Posts: 11,928	Having your ratio at 1:1 is a good thing because it saves your RAM speed going through the roof when you're OC'ing your CPU... It basically halves your RAM speed, so that as you OC your CPU, you start to bring the RAM back up to it's default speed... __________________ Intel Core 2 Duo E6300 @ 2.8GHz Gigabyte GA-965P-S3 - Rev 3.3 4GB Crucial Ballistix @ 800MHz PNY 8800GTS G92 @ 800/2000/1000 Corsair HX520W Windows Vista Home Premium Seagate Barracuda 500GB 7200.11 SATA II Tuniq Tower LED OCZ XTC RAM Cooler Antec 900 (Modded) 3DMark06: 11,500 Winner of Photo Tournament: People, Jewelry & Dead Space Member of COD4 [CF] Clan: [CF] Kornowski

03-19-2008, 01:32 PM	#3 (permalink)
[-0MEGA-] Diamond Member Join Date: Nov 2004 Location: Concord, NH Age: 19 Posts: 27,046	It is a good thing, but Danny he's asking why a 1:1 ratio gives you better performance. Sorry, I don't have an answer to your question, __________________ Desktop // Laptop Core 2 Quad Q9550 @ 4.0GHz // Core 2 Duo P8400 2.26GHz Asus Rampage Formula X48 // Intel PM45 ATI 4870X2 2GB GDDR5 // 512MB GDDR3 9800M GTS 4GB (2x 2GB) DDR2 940 // 4GB DDR3 800 750GB SATAII w/32MB // 200GB SATAII 7200RPM Creative SB X-Fi Titanium Fatal1ty SilverStone 750W +12V@60A 3DMark06: 21391 // 9179

03-19-2008, 01:55 PM	#5 (permalink)
nffc10 Diamond Member Join Date: Oct 2006 Location: Nottingham Age: 17 Posts: 1,659	I've been told it's like this: If you have a one lane road from the CPU to the RAM and a one lane road from the RAM to the CPU (1:1) theres less chance of a backlog in traffic (data). Whereas if you have a 2 lane road from the CPU to the RAM and a one lane road from the RAM to the CPU then there's going to be more traffic going into the RAM than the road out (to the CPU) can hold. That will cause a backlog in data and result in lower performance. That's just an idea. __________________ Amd Athlon 64 X2 6000+ @ 3.31GHz Asrock AM2NF3 VSTA 2gb Corsair XMS2 PC5400 Sapphire X800XL 256MB AGP 80GB Maxtor Hard Drive OCZ StealthXtreme 600W PSU Pictures - 1 2 3 http://www.treasuretrooper.com/438654

03-19-2008, 02:29 PM	#6 (permalink)
michaelmcgo Bronze Member Join Date: Dec 2007 Posts: 92	I was wondering about performance. Currently I am running my CPU at 3.0 Ghz (333x9), with a 1:2.4 Ratio. I was wondering how much better performance I'd get with my ratio at 1:1 (FSB at 400). Same RAM speed, different ratio. __________________ My current computer: CPU: Intel E2180 @3.0 Ghz 24/7 cooled with Freezer 7 Pro GPU: MSI 8800GT 512MB OCed to 700 core/ 1750 Shaders / 2000 Mem MOBO: Gigabyte GA-P35-DS3L v2.0 RAM: 2GB G.Skill DDR2 800 running at 1066Mhz (5,5,5,12) Hard Drive: Seagate Barracuda 250GB 7,200rpm Monitor: 22" widescreen Envision LCD Speakers: Logitech 2.1 w/ 8" sub OS: Vista Premium 32 Bit

03-19-2008, 02:48 PM	#7 (permalink)
Cromewell Moderator Join Date: Dec 2004 Location: Canada Age: 24 Posts: 10,103	I don't know what the exact difference would be. But as to why 1:1 is better, nffc10 is right, all the clocks line up instead of having to wait at one end or the other. __________________ You know what the chain of command is? It's the chain I go get and beat you with 'til ya understand who's in ruttin' command here. I must plug a couple comics because they are good :D: www.ctrlaltdel-online.com www.userfriendly.org

03-19-2008, 03:05 PM	#9 (permalink)
michaelmcgo Bronze Member Join Date: Dec 2007 Posts: 92	Is there a performance comparison anybody knows about between 1:1 and not 1:1? Has anyone tried both setups and noticed a difference? __________________ My current computer: CPU: Intel E2180 @3.0 Ghz 24/7 cooled with Freezer 7 Pro GPU: MSI 8800GT 512MB OCed to 700 core/ 1750 Shaders / 2000 Mem MOBO: Gigabyte GA-P35-DS3L v2.0 RAM: 2GB G.Skill DDR2 800 running at 1066Mhz (5,5,5,12) Hard Drive: Seagate Barracuda 250GB 7,200rpm Monitor: 22" widescreen Envision LCD Speakers: Logitech 2.1 w/ 8" sub OS: Vista Premium 32 Bit

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