Using a 1/2 multi, why is this BAD?

newls1 · 07-05-05, 03:19 PM

I did some searching, but really could find my answer. I'm wanting to take my FSB (HTT) from 262Mhz, to 260MHz and increase my mutli from 11x to 11.5x. What are the dis-advantages when doing something like this? I read where is screws with your ram divider, etc.... but is all this true...? thank you

Riptide · 07-05-05, 03:23 PM

It's not bad per-se. But if you use a half multiplier for your CPU you won't gain any extra bandwidth for your memory. IOW, 200x10 = the same bandwidth as 200x10.5.

newls1 · 07-05-05, 03:45 PM

Quote:

Originally Posted by Riptide

It's not bad per-se. But if you use a half multiplier for your CPU you won't gain any extra bandwidth for your memory. IOW, 200x10 = the same bandwidth as 200x10.5.

OK, with that said, would you agree with this: "IF" 1 "JUMP UP" in a multiplier = 200Mhz, then a half multi = 100Mhz, then this mean that if I can GAIN 100more MHz (stability being of a concern) and still use my 260+FSB for my memory bandwidth, then wouldn't that 100MHz increase be benificial?

$n][pErMan · 07-05-05, 06:32 PM

Quote:

Originally Posted by newls1

OK, with that said, would you agree with this: "IF" 1 "JUMP UP" in a multiplier = 200Mhz, then a half multi = 100Mhz, then this mean that if I can GAIN 100more MHz (stability being of a concern) and still use my 260+FSB for my memory bandwidth, then wouldn't that 100MHz increase be benificial?

Ok .. I think what your saying is if you wanna keep the same FSB (for stability reasons) and up the multiplier on the CPU to only gain frequency increase in the CPU and not the FSB... if thats good? Assuming you cant increase your FSB more but can still be stable at a higher multiplier with that FSB .. then yes... its good.

newls1 · 07-05-05, 06:50 PM

**UPDATE** I tried to use the 11.5x multi, but the computer wouldn't post. The CPU really needs more Vcore, but 1.636 is all I can do with my cooling. Ol-well, it was worth a try.....

rflair · 07-05-05, 07:30 PM

This nice chart shows you why you shouldn't, or should

http://www.xtremesystems.org/forums/...ad.php?t=41595

You lose memory bandwidth with half multipliers in the higher FSB range.

newls1 · 07-05-05, 07:38 PM

thanks, that is a great chart....

nIghtorius · 07-06-05, 11:44 AM

The Atlhon64's memorycontroller has a divider..

memory speed=

("FSB" * Multiplier) / (memdivider) = xxx Mhz

memdivider ~= Multiplier, but when multiplier is 10.5x then memdivider will be 11.
when multiplier is 11.5, memdivider = 12, etc.. only when multiplier is xx.0 then memdivider will be xx.0 (equal)

so when running a 260 Mhz "FSB" @ 10.5 multiplier your memory speed is.
memspeed = (260 * 10.5) / 11 = 248Mhz

and @ 10.0 multiplier it is.
memspeed = (260 * 10) / 10 = 260Mhz

see?

**john19055** · 07-24-05, 12:10 AM

I can't never get it to come out right when I try to use half multiplers.

Lfctony · 07-25-05, 08:47 PM

Using a half-multi suits mine as I'm using the 1.5 bios for my mobo, which doesn't allow me to post with HTT at above 230. I can't be bothered to flash back to 1.2 again, so I'm running at 10.5x229, ram is at 200 exactly, system seems stable so far.

rflair · 07-26-05, 09:02 AM

Quote:

Originally Posted by Lfctony

Using a half-multi suits mine as I'm using the 1.5 bios for my mobo, which doesn't allow me to post with HTT at above 230. I can't be bothered to flash back to 1.2 again, so I'm running at 10.5x229, ram is at 200 exactly, system seems stable so far.

And thats all that really matter, a nice stable system.

Lfctony · 07-26-05, 09:20 AM

Well, it was stable, I'm back to stock again. System failed to boot and the screen was garbled in Windows. I restarted and Windows reported a critical error on any of 4 things including CPU and motherboard. So it seems it's not stable after all.

07-05-05, 03:19 PM	#1
newls1 Registered User Join Date: Dec 2004 Posts: 596	Using a 1/2 multi, why is this BAD? I did some searching, but really could find my answer. I'm wanting to take my FSB (HTT) from 262Mhz, to 260MHz and increase my mutli from 11x to 11.5x. What are the dis-advantages when doing something like this? I read where is screws with your ram divider, etc.... but is all this true...? thank you __________________ ASUS P5Q-PRO @ 408FSB / Q6700 @ 3.71GHz AIR COOLED / eVGA GTX295 @ 725c1585s2400mem / 4GB G.SKILL PC8500 @ DDR1025 / AUDIGY4 / WD640GB / WD80GB / 28" Hanns-G 3ms LCD

07-05-05, 03:23 PM	#2
Riptide Registered User Join Date: Oct 2002 Location: Billings, MT Posts: 8,303	Re: Using a 1/2 multi, why is this BAD? It's not bad per-se. But if you use a half multiplier for your CPU you won't gain any extra bandwidth for your memory. IOW, 200x10 = the same bandwidth as 200x10.5.

07-05-05, 06:50 PM	#5
newls1 Registered User Join Date: Dec 2004 Posts: 596	Re: Using a 1/2 multi, why is this BAD? UPDATE I tried to use the 11.5x multi, but the computer wouldn't post. The CPU really needs more Vcore, but 1.636 is all I can do with my cooling. Ol-well, it was worth a try..... __________________ ASUS P5Q-PRO @ 408FSB / Q6700 @ 3.71GHz AIR COOLED / eVGA GTX295 @ 725c1585s2400mem / 4GB G.SKILL PC8500 @ DDR1025 / AUDIGY4 / WD640GB / WD80GB / 28" Hanns-G 3ms LCD

07-05-05, 07:30 PM	#6
rflair W OOO OOO Join Date: Nov 2004 Location: T.O. Canada Posts: 714	Re: Using a 1/2 multi, why is this BAD? This nice chart shows you why you shouldn't, or should http://www.xtremesystems.org/forums/...ad.php?t=41595 You lose memory bandwidth with half multipliers in the higher FSB range.

07-05-05, 07:38 PM	#7
newls1 Registered User Join Date: Dec 2004 Posts: 596	Re: Using a 1/2 multi, why is this BAD? thanks, that is a great chart.... __________________ ASUS P5Q-PRO @ 408FSB / Q6700 @ 3.71GHz AIR COOLED / eVGA GTX295 @ 725c1585s2400mem / 4GB G.SKILL PC8500 @ DDR1025 / AUDIGY4 / WD640GB / WD80GB / 28" Hanns-G 3ms LCD

07-06-05, 11:44 AM	#8
nIghtorius Registered User Join Date: Sep 2002 Location: Netherlands Posts: 236	Re: Using a 1/2 multi, why is this BAD? The Atlhon64's memorycontroller has a divider.. memory speed= ("FSB" * Multiplier) / (memdivider) = xxx Mhz memdivider ~= Multiplier, but when multiplier is 10.5x then memdivider will be 11. when multiplier is 11.5, memdivider = 12, etc.. only when multiplier is xx.0 then memdivider will be xx.0 (equal) so when running a 260 Mhz "FSB" @ 10.5 multiplier your memory speed is. memspeed = (260 * 10.5) / 11 = 248Mhz and @ 10.0 multiplier it is. memspeed = (260 * 10) / 10 = 260Mhz see? __________________ New! Rig 'Titan': Intel Core Duo 6600 \| Zalman 9500CU-LED \| 2GB DDR-2 667 \| P5N-SLI \| BFG 8800 GTX \| 24" Dell FPW2407 \| zalman ZM600-HP modular PSU \| 1050GB TOTAL HDD \| Photosmart 7760 \| Microsoft Cordless Laser Desktop 5000 \| Logitech Z2300 2.1 \| MX700 Backup Mouse \| Antec Performance One P180B (Black) \| Vista Business 32-bits Laptop: IBM ThinkPad T43 \| Pentium M 750 \| Wireless b/g \| 60GB 7200RPM \| DVD Writer \| 512MB DDR2 \| 1400x1050 15" \| WinXP SP2

07-24-05, 12:10 AM	#9
john19055 Join Date: Jul 2002 Location: GREENVILLE,TX Posts: 3,851	Re: Using a 1/2 multi, why is this BAD? I can't never get it to come out right when I try to use half multiplers. __________________ Intel i7-3820+Corsair H-100+ASROCK X79-Extreme4+16gigs G.Skill PC1600DDR3+2-ASUS DirectCU II GTX-670 in SLI+Crucial 256g-SSD+2- Samsung 1-TB+2-WesternDigtial 640g+LG-12x Blu-Ray Burner+1100w CoolerMaster+Antec-P280 case+50" Plasma PM6700+Logitech Mouse+Keyboard+Pioneer VSX-1020+Polk Audio Speakers

07-25-05, 08:47 PM	#10
Lfctony Registered User Join Date: May 2003 Location: Larnaca, Cyprus Posts: 4,152	Re: Using a 1/2 multi, why is this BAD? Using a half-multi suits mine as I'm using the 1.5 bios for my mobo, which doesn't allow me to post with HTT at above 230. I can't be bothered to flash back to 1.2 again, so I'm running at 10.5x229, ram is at 200 exactly, system seems stable so far. __________________ Fafnir: Intel Core 2 Quad 6600@3.2Ghz\|eVGA 780i SLI\|PNY GTX480 \|Kingston DDR667 4096MB\|WD Black Caviar 500GB\|Seagate SATA 250GB\|Seagate SATA 200GB\| Seagate SATA 160GB\|OptiArc AD-7173S DVDRW\|Nec 3351 DVDRW\|Creative X-FI XM\|LG Flatron W2261V\|Logitech X-530\|Thermaltake Armor\|Amptac 850W SLI PSU\|Logitech G9 Mouse\|Xigmatek HDT S-1283 CPU Cooler\|Windows 7/FW 257.21 PS2 - Wii - Xbox - Xbox360 - PSP - GC - PS3 Owner Boycott Starforce... Quis Custodiet Ipsos Custodes?

07-26-05, 09:20 AM	#12
Lfctony Registered User Join Date: May 2003 Location: Larnaca, Cyprus Posts: 4,152	Re: Using a 1/2 multi, why is this BAD? Well, it was stable, I'm back to stock again. System failed to boot and the screen was garbled in Windows. I restarted and Windows reported a critical error on any of 4 things including CPU and motherboard. So it seems it's not stable after all. __________________ Fafnir: Intel Core 2 Quad 6600@3.2Ghz\|eVGA 780i SLI\|PNY GTX480 \|Kingston DDR667 4096MB\|WD Black Caviar 500GB\|Seagate SATA 250GB\|Seagate SATA 200GB\| Seagate SATA 160GB\|OptiArc AD-7173S DVDRW\|Nec 3351 DVDRW\|Creative X-FI XM\|LG Flatron W2261V\|Logitech X-530\|Thermaltake Armor\|Amptac 850W SLI PSU\|Logitech G9 Mouse\|Xigmatek HDT S-1283 CPU Cooler\|Windows 7/FW 257.21 PS2 - Wii - Xbox - Xbox360 - PSP - GC - PS3 Owner Boycott Starforce... Quis Custodiet Ipsos Custodes?

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