Overclock.net › Forums › AMD › AMD CPUs › question about fsb
New Posts  All Forums:Forum Nav:

question about fsb

post #1 of 16
Thread Starter 
ok this has been bugging me... how come i can reach such a high fsb speed (325) at 8x on my proc. but when i bump it up to 9x i can't reach it? i'm stuck at something like 290ish? is it better to use a lower fsb or higher and what would be the better setting for the mult?

Note: my ram can goto 460mhz and htt can goto 2020mhz.
post #2 of 16
Lower multipliers allow higher FSB. It's just the way it goes. Something to do with frequency limits or something. I can reach 320MHz with a x9 multiplier, 288MHz at x10, and 260MHz at x11. In my experience it's better to have a high FSB than a high multiplier. However you have to take into consideration if your RAM can handle those speeds (even on a divider it may be difficult to break 300MHz+). You just have to play around with your settings and run some benchmarks to see what gives you the best performance.

Edit: My current configuration of 320HTT with memory running 1:1 with terribly loose timmings (3-5-5-10) gets me more points in benchmarks (1,000+ in AM3 and 10+ in 3DMark05) than 288HTT with the memory running at 240MHz with tight timmings (2-3-3-6). I was under the impression that lower timmings meant greater performance in A64s.
Magicbox
(17 items)
 
crapbox
(13 items)
 
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 AX370-Gamin K7 Nitro+ RX480 Corsair LPX 
Hard DriveHard DriveHard DriveCooling
Samsung 850 EVO  Kingston HyperX 3K Seagate Barracuda 7200.14 Noctua NH-D15 
OSOSMonitorKeyboard
Kubuntu  Windows 10 Pro Dell U2515H CM Quickfire TK (Cherry Blue) 
PowerCaseMouseMouse Pad
EVGA 750 G2 Enthoo Pro Logitech G502 Logitech G440 
CPUMotherboardGraphicsRAM
Sempron 3300+ HP stock mobo (laptop) 200M (IGP) 2x1GB PC3200 
Hard DriveOptical DriveOSMonitor
100GB ATA133 DVD/CDRW Kubuntu 32 bit 14.1" (1280x768) 
Power
6 cell 
  hide details  
Reply
Magicbox
(17 items)
 
crapbox
(13 items)
 
 
CPUMotherboardGraphicsRAM
Ryzen 7 1700 AX370-Gamin K7 Nitro+ RX480 Corsair LPX 
Hard DriveHard DriveHard DriveCooling
Samsung 850 EVO  Kingston HyperX 3K Seagate Barracuda 7200.14 Noctua NH-D15 
OSOSMonitorKeyboard
Kubuntu  Windows 10 Pro Dell U2515H CM Quickfire TK (Cherry Blue) 
PowerCaseMouseMouse Pad
EVGA 750 G2 Enthoo Pro Logitech G502 Logitech G440 
CPUMotherboardGraphicsRAM
Sempron 3300+ HP stock mobo (laptop) 200M (IGP) 2x1GB PC3200 
Hard DriveOptical DriveOSMonitor
100GB ATA133 DVD/CDRW Kubuntu 32 bit 14.1" (1280x768) 
Power
6 cell 
  hide details  
Reply
post #3 of 16
Because its all about cpu speed, you are looking at multipliers and FSB all wrong.
300x11 = 3300mhz
300x10 = 3000mhz
300x9 = 2700mhz

You cant just plug in a FSB# and expect to get it at all multipliers, lol...
Your cpu has a maximum speed.

Unfortunately with the 3000+'s you only have a x9 multi, so you dont have much flexibility. I would recommend ram that can run DDR500 - DDR600 if you want to get more out of the cpu...you are stuck.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i3-540 @ 3.68ghz Biostar TH55 HD HD 5770 1GB Gskill 2x2G DDR3 @ 1600mhz 
Hard DrivePowerCase
Raptor75 10,000rpm ThermalTake TR2 500w Antec SuperLanboy 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i3-540 @ 3.68ghz Biostar TH55 HD HD 5770 1GB Gskill 2x2G DDR3 @ 1600mhz 
Hard DrivePowerCase
Raptor75 10,000rpm ThermalTake TR2 500w Antec SuperLanboy 
  hide details  
Reply
post #4 of 16
Thread Starter 
wow... hmm this will require more research... thanks for the input i was kinda just wondering that and desided to post the question
post #5 of 16
but actually looser timings at higher FSB speeds will get you better performance. i'll post it today if i can remember. i mean you want the tightest timings possible, because running 200 2-2-2-5 is going to be faster than running 200 at 2.5-3-3-7. but you can jack the 2.5-3-3-7 settings all the way up to ohhh, 300 htt @ 1:1 ratio and you'd be haulin, getting a lot more bandwidth. definitely a lot mroe than 200 @ 2-2-2-5.

in other words, if you're worried about tighter timings, find your max htt first that your RAM will support, then work with the timings. my XL will do 300 @ 2-3-3-7 2t. so just hack around with it.

and SLI Guru, running 4 256 sticks will hurt your overclock because you're stressing your memory controller. its always best to have 2 sticks if possible (unless you want like 4 or 8 gigs of memory).

and the reason why you can run 325 x 8 is because that makes your proc speed at 2.6 GHz, but when you push it to 325 x9 you're making it run at 2.925 GHz which is freakin overkill for a 3000+ i'd say.
The pink bicycle
(13 items)
 
  
CPUMotherboardGraphicsRAM
q6600 @ 3.4 GHz Asus P5N-E Asus 4890 1 gb 2 x 2 GB OCZ Reapers 
Hard DriveOptical DriveOSMonitor
2 x 150 GB Raptors RAID0 work in progress Windows 7 7600 x64 19" Acer LCD 
KeyboardPowerCaseMouse
Microsoft basic Antec 650w my desk mx518 
Mouse Pad
steelpad QcK+ 
  hide details  
Reply
The pink bicycle
(13 items)
 
  
CPUMotherboardGraphicsRAM
q6600 @ 3.4 GHz Asus P5N-E Asus 4890 1 gb 2 x 2 GB OCZ Reapers 
Hard DriveOptical DriveOSMonitor
2 x 150 GB Raptors RAID0 work in progress Windows 7 7600 x64 19" Acer LCD 
KeyboardPowerCaseMouse
Microsoft basic Antec 650w my desk mx518 
Mouse Pad
steelpad QcK+ 
  hide details  
Reply
post #6 of 16
Thread Starter 
i agree pushing it to 9x325 is overkill but i'm talking like pushing it in a ratio kinda form... like 9x290 and i can't too much more outa it. it totally goes unstable if i go much high which i don't understand because if i'm about to actually push it to 325fsb then why couldn't i have a stable 9x? that's what i'm wondering... i'm not worried about my ram as i can just lower or raise the ratio... honestly i think what it is, is my power supply isn't giving my system enough power... a 420watt for an sli set up, 4 ram banks and an overclocked cpu (by 800mhz)1dvd drive and 1sata drive and a ide hd.

plus on top of all that i know that i'm able to hit 3ghz on my proc because tons of ppl have already done it b4. i know cooling wont be an issue as my water cooling keeps things pretty cool. right now under full load running for 14 hours, my cpu is at 35c with 1.488volts...

the one thing you did say was that i'm putting alot of stress on my mem. controller with the four drr sticks... how much would this limit my overclock?
post #7 of 16
Quote:
Originally Posted by AMD SLI guru
i agree pushing it to 9x325 is overkill but i'm talking like pushing it in a ratio kinda form... like 9x290 and i can't too much more outa it. it totally goes unstable if i go much high which i don't understand because if i'm about to actually push it to 325fsb then why couldn't i have a stable 9x? that's what i'm wondering... i'm not worried about my ram as i can just lower or raise the ratio... honestly i think what it is, is my power supply isn't giving my system enough power... a 420watt for an sli set up, 4 ram banks and an overclocked cpu (by 800mhz) i think i need to up the power.

plus on top of all that i know that i'm able to hit 3ghz on my proc because tons of ppl have already done it b4. i know cooling wont be an issue as my water cooling keeps things pretty cool. right now under full load running for 14 hours, my cpu is at 35c...

the one thing you did say was that i'm putting alot of stress on my mem. controller with the four drr sticks... how much would this limit my overclock?
OMG, #1 you can't hit 3 GHz on your processor because of your memory
#2 not all processors are the same, if you hit 3.0 GHz on air its suicide for your chip. #3 you can't push 9x CPU Multi on 325 HTT Because you're pushing your processor clock toooo far
325 (Htt) x 9 (CPU Multi) = too high for your CPU to be stable at the current voltage.....do you get it?

and the big reason why you can't hit 3.0 GHz on your proc is BECAUSE you're stressing your memory controller w/ 4 sticks of 512 instead of 2 sticks of 1 gb.

EDIT
and i didn't realize you had watercooling, but still yet 3.0 GHz is a lot to push out of a 3000+. i bet that you have to have more than watercooling to hit it. phase change....
The pink bicycle
(13 items)
 
  
CPUMotherboardGraphicsRAM
q6600 @ 3.4 GHz Asus P5N-E Asus 4890 1 gb 2 x 2 GB OCZ Reapers 
Hard DriveOptical DriveOSMonitor
2 x 150 GB Raptors RAID0 work in progress Windows 7 7600 x64 19" Acer LCD 
KeyboardPowerCaseMouse
Microsoft basic Antec 650w my desk mx518 
Mouse Pad
steelpad QcK+ 
  hide details  
Reply
The pink bicycle
(13 items)
 
  
CPUMotherboardGraphicsRAM
q6600 @ 3.4 GHz Asus P5N-E Asus 4890 1 gb 2 x 2 GB OCZ Reapers 
Hard DriveOptical DriveOSMonitor
2 x 150 GB Raptors RAID0 work in progress Windows 7 7600 x64 19" Acer LCD 
KeyboardPowerCaseMouse
Microsoft basic Antec 650w my desk mx518 
Mouse Pad
steelpad QcK+ 
  hide details  
Reply
post #8 of 16
Thread Starter 
Quote:
Originally Posted by buttmud
OMG, #1 you can't hit 3 GHz on your processor because of your memory
#2 not all processors are the same, if you hit 3.0 GHz on air its suicide for your chip. #3 you can't push 9x CPU Multi on 325 HTT Because you're pushing your processor clock toooo far
325 (Htt) x 9 (CPU Multi) = too high for your CPU to be stable at the current voltage.....do you get it?

and the big reason why you can't hit 3.0 GHz on your proc is BECAUSE you're stressing your memory controller w/ 4 sticks of 512 instead of 2 sticks of 1 gb.

#1 i have water cooling
#2 why couldn't i hit 3ghz on my memory? why not just set up a divider or take 2 chips out and run on just 2? wouldn't a divider solve the problem of my memory not being able to keep up with the fsb?
#3 then how are other ppl able to push their's up to 3ghz? it's not a problem to up the volts at all... i'm not worried about that... i'm just saying that 3ghz is possible... there are a few ppl on this site that have it.

thank you for telling me about my mem controller.. i didn't know that i was stressing it THAT much... i guess i'll just pull 2 sticks and run 512mb instead of 1gig till i can get some new chips.
post #9 of 16
Thread Starter 
man learning stuff everyday
post #10 of 16
I don't know anybody that's hit 3Ghz on a 3000+ without Phase Change
It's probably happened, but it must be extremely rare
Clevo P170HM
(6 items)
 
  
CPUGraphicsRAMHard Drive
i7 2760QM HD 6990m Samsung 1333mhz Crucial M4 SSD 
Hard DriveOS
Western Digital Black 500gb Windows 7 64 Bit 
  hide details  
Reply
Clevo P170HM
(6 items)
 
  
CPUGraphicsRAMHard Drive
i7 2760QM HD 6990m Samsung 1333mhz Crucial M4 SSD 
Hard DriveOS
Western Digital Black 500gb Windows 7 64 Bit 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: AMD CPUs
Overclock.net › Forums › AMD › AMD CPUs › question about fsb