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Need Help with FSB:DRAM ratio

post #1 of 10
Thread Starter 
im a bit confused about this.

so in order for my FSBRAM to be at 1:1 i have to have my fsb and ram set at same mhz? so if my fsb is at 1425, and ram is at 1066, i have an 11:16 ratio. this is what i have atm. so if i change 1066 to 1425 it will be 1:1?

im not going to attempt this, but im just asking if thats the case, and if so, is it safe to attempt it.

if not, what is the formula, the math for this? im oc'd at 3.2 atm, my memory is set at 1067 FSB at 1425. cpuz gives me 11:16 ratio.

any replies, thx in advance.
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post #2 of 10
some mainboards let you set the ratio. others do it automatically depending on the FSB you shoose. others let you pick the FSB and mem speed, then you can calculate the ratio. its basically the ratio of your fsb to mem speed. you're on the right track.
    
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post #3 of 10
You need to post system specs in user cp,but you're referring to qdr not fsb divide qdr by 4 and ram by 2.example-1:1=333fsb(1333qdr)-ram333(667ddr2)
    
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post #4 of 10
Thread Starter 
well in bios it says fsb(qdr) so i assume im talking about the same thing, im not sure i understand the difference, but thats what i have been raising in order to oc my processor =P im new to this, trying not to sound stupid.

ok so if im at 1425 fsb(qdr) , what would my memory have to be set at to get optimal performance? should i set it down or up?

with your math my memory should be at 712.5 in order to get 1:1?
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Q6600 G0 @3.4ghz xfx nforce 780i 3-way sli 2x8800gtx 2 x 2gb Patriot Extreme PC8500 
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2 x WD 10,000rpm 150gb raptors LG 20x super multi Windows Vista 64 bit 17' samsung syncmaster 712n (upgrade soon!) 
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post #5 of 10
Don't NVidia chipsets let you unlink your RAM?
post #6 of 10
Thread Starter 
yeah its unlinked, but im not sure what that means besides manually editing both of them.. i was just curious of how i can get better performance, and if going 1:1 would enhance it or not. so im trying to understand why and how it works.
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post #7 of 10
going 1:1 would definitely enhance performance but may screw up your oc and leave your system unstable. raising the fsb you sometimes have to lower the ram speed to get a stable system. you just have to play around with the numbers until you get a stable system thats optimized.
    
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post #8 of 10
Back in the P4 days, running your RAM at 1:1 gave you the best performance, that isn't necessarily true these days. Most Intel set-ups like faster RAM now. You'll have to run benchmarks to find the optimum settings for you.
post #9 of 10
Thread Starter 
Quote:
Originally Posted by RussianGrimmReaper View Post
Back in the P4 days, running your RAM at 1:1 gave you the best performance, that isn't necessarily true these days. Most Intel set-ups like faster RAM now. You'll have to run benchmarks to find the optimum settings for you.

copy.
ok i guess ill keep testing. right now im stable at 3.2 but im wanting a better 3dmark score =P atm it's 15968, just trying to figure out a way to get it higher.
im doing superpi 1m at 16.3 secs..

i sorta wish id never found this site, because i was happy with stock **** before. now im obssessed with speed, kinda like my hotrod. the last thing i need is another speed habit, looks like its too late.
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CPUMotherboardGraphicsRAM
Q6600 G0 @3.4ghz xfx nforce 780i 3-way sli 2x8800gtx 2 x 2gb Patriot Extreme PC8500 
Hard DriveOptical DriveOSMonitor
2 x WD 10,000rpm 150gb raptors LG 20x super multi Windows Vista 64 bit 17' samsung syncmaster 712n (upgrade soon!) 
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800w BFG Antec 900 
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First Attempt
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CPUMotherboardGraphicsRAM
Q6600 G0 @3.4ghz xfx nforce 780i 3-way sli 2x8800gtx 2 x 2gb Patriot Extreme PC8500 
Hard DriveOptical DriveOSMonitor
2 x WD 10,000rpm 150gb raptors LG 20x super multi Windows Vista 64 bit 17' samsung syncmaster 712n (upgrade soon!) 
PowerCase
800w BFG Antec 900 
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post #10 of 10
If you can tighten timings (especially if you can manage a T1 command rate) and run 1:1 (linked), chances are you will see a small performance boost, but only on NVIDIA chipsets. When you link the memory clock to the FSB on an NVIDIA chipset, the NB does not have to go through the same clock crossing procedure it normally would, cutting latency and increasing bandwidth.

Intel chipsets are a bit more efficent when it comes to memory copies and read/write prioritization, but a 1:1 ratio on them has zero performance benifit. A similar clock crossing procedure is done regardless of ratio. Higher memory speeds on Intel chipsets allow for lower tRD (reducing the chipset latency, and upping potential bandwidth), in addition to the obvious benefit provided by faster memory.
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CPUMotherboardGraphicsRAM
5820K @ 4.2/3.5GHz core/uncore, 1.175/1.15v Gigabyte X99 SOC Champion (F22n) Gigabyte AORUS GTX 1080 Ti (F3P) @ 2025/1485, 1... 4x4GiB Crucial @ 2667, 12-12-12-28-T1, 1.34v 
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CPUMotherboardGraphicsRAM
X5670 @ 4.4/3.2GHz core/uncore, 1.36 vcore, 1.2... Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Sapphire Fury Nitro OC+ @ 1053/500, 1.225vGPU/1... 2x Samsung MV-3V4G3D/US @ 2000, 10-11-11-30-T1,... 
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1x Crucial BLT4G3D1608ET3LX0 @ 2000, 10-11-11-3... OCZ (Toshiba) Trion 150 120GB Hyundai Sapphire 120GB 3x Hitachi Deskstar 7k1000.C 1TB 
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i7-6800K @ 4.3/3.5GHz core/uncore, 1.36/1.2v ASRock X99 OC Formula (P3.10) GTX 780 (temporary) 4x4GiB Crucial DDR4-2400 @ 11-13-12-28-T2, 1.33v 
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In progress
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CPUMotherboardGraphicsRAM
5820K @ 4.2/3.5GHz core/uncore, 1.175/1.15v Gigabyte X99 SOC Champion (F22n) Gigabyte AORUS GTX 1080 Ti (F3P) @ 2025/1485, 1... 4x4GiB Crucial @ 2667, 12-12-12-28-T1, 1.34v 
Hard DriveHard DriveHard DriveCooling
Plextor M6e 128GB (fw 1.06) M.2 (PCI-E 2.0 2x) 2x Crucial M4 256GB 4x WD Scorpio Black 500GB Noctua NH-D15 
OSMonitorKeyboardPower
Windows 7 Professional x64 SP1 BenQ BL3200PT Filco Majestouch Tenkeyless (MX Brown) Corsair RM1000x 
CaseMouseAudio
Fractal Design Define R4 Logitech G402 Realtek ALC1150 + M-Audio AV40 
CPUMotherboardGraphicsRAM
X5670 @ 4.4/3.2GHz core/uncore, 1.36 vcore, 1.2... Gigabyte X58A-UD5 r2.0 w/FF3mod10 BIOS Sapphire Fury Nitro OC+ @ 1053/500, 1.225vGPU/1... 2x Samsung MV-3V4G3D/US @ 2000, 10-11-11-30-T1,... 
RAMHard DriveHard DriveHard Drive
1x Crucial BLT4G3D1608ET3LX0 @ 2000, 10-11-11-3... OCZ (Toshiba) Trion 150 120GB Hyundai Sapphire 120GB 3x Hitachi Deskstar 7k1000.C 1TB 
CoolingOSPowerCase
Noctua NH-D14 Windows 7 Pro x64 SP1 Antec TP-750 Fractal Design R5 
Audio
ASUS Xonar DS 
CPUMotherboardGraphicsRAM
i7-6800K @ 4.3/3.5GHz core/uncore, 1.36/1.2v ASRock X99 OC Formula (P3.10) GTX 780 (temporary) 4x4GiB Crucial DDR4-2400 @ 11-13-12-28-T2, 1.33v 
Hard DriveHard DriveCoolingOS
Intel 600p 256GB NVMe 2x HGST Travelstar 7k1000 1TB Corsair H55 (temporary) Windows Server 2016 Datacenter 
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