Overclock.net › Forums › Intel › Intel - General › Higher FSB, lower GPU performance?
New Posts  All Forums:Forum Nav:

Higher FSB, lower GPU performance?

post #1 of 10
Thread Starter 
While overclocking my system, I've noticed a strange thing.

I have an E6400 which is 8X266 stock. My graphics -> Gigabyte 7900GS.

When I run it 8X350 = 2.8GHz, performance is great. I get 4420 3DMark06 score

When I run it 7X400 = 2.8GHz, CPU performance is similar but my 3DMark06 score drops to 2200!! I also notice in games my framerate is much lower.

I tried a BIOS update from 0614 to 0804. Made no difference.

I used throttlewatch and CPU-Z to monitor CPU speed to make sure its not throttling back.

So what could it be? Is the CPU not really multiplier unlocked and by changing the multiplier to 7X screw up performance big time? Am I just pushing the FSB too much? System was stable on 2X Prime95 at 400 FSB...

I will experiment 7X350 and 8X400 (if I can get it there cool enough), but I wanted to know if anyone here had any ideas as to why my GPU performance is crapping out at 7X400.

I have PCIe locked to 100 and PCI to 33.3 btw.

Thanks in advance.
     
CPUMotherboardGraphicsRAM
7700K Delid @5.1GHz @1.4V Asus Z270F Strix Asus RX480 Strix @ 1400MHz Corsair Vengance PC3200 2x8GB 
Hard DriveHard DriveHard DriveOptical Drive
Sandisk Ultra II 960GB 2 x Intel 530 SSD 2 x 3TB HDD LG BD-R 
CoolingOSMonitorPower
Noctua NH-D15 Windows 10 Home Dell 27" 1080p Seasonic Prime 750W Titanium 
CaseMouse
Fractal Define R5 Razer DeathAdder 
CPUMotherboardGraphicsRAM
i7 2600K @4.6GHz @1.4V Gigabyte GA-Z68-D3H-B3 AMD RX480 4x4GB GSkill RipjawsX 1600 CL8 
Hard DriveOptical DriveCoolingOS
2 X Intel 530 240GB + 4TB HDD LG BD-RW Cooler Master Hyper 212 Windows 10 
MonitorKeyboardPowerCase
Dell 27" 1080p Microsoft Seasonic Prime 750W Titanium Fractal Define R5 
Mouse
Razer DeathAdder 
  hide details  
Reply
     
CPUMotherboardGraphicsRAM
7700K Delid @5.1GHz @1.4V Asus Z270F Strix Asus RX480 Strix @ 1400MHz Corsair Vengance PC3200 2x8GB 
Hard DriveHard DriveHard DriveOptical Drive
Sandisk Ultra II 960GB 2 x Intel 530 SSD 2 x 3TB HDD LG BD-R 
CoolingOSMonitorPower
Noctua NH-D15 Windows 10 Home Dell 27" 1080p Seasonic Prime 750W Titanium 
CaseMouse
Fractal Define R5 Razer DeathAdder 
CPUMotherboardGraphicsRAM
i7 2600K @4.6GHz @1.4V Gigabyte GA-Z68-D3H-B3 AMD RX480 4x4GB GSkill RipjawsX 1600 CL8 
Hard DriveOptical DriveCoolingOS
2 X Intel 530 240GB + 4TB HDD LG BD-RW Cooler Master Hyper 212 Windows 10 
MonitorKeyboardPowerCase
Dell 27" 1080p Microsoft Seasonic Prime 750W Titanium Fractal Define R5 
Mouse
Razer DeathAdder 
  hide details  
Reply
post #2 of 10
Thread Starter 
Update:

7X350FSB yeilds good results: 4351
7X380FSB yields bad 3DMark #'s

Doesn't appear to be related to the multiplier.
So somewhere between 350 and 380 FSB is causing poor GPU performance, but windows runs fine...
     
CPUMotherboardGraphicsRAM
7700K Delid @5.1GHz @1.4V Asus Z270F Strix Asus RX480 Strix @ 1400MHz Corsair Vengance PC3200 2x8GB 
Hard DriveHard DriveHard DriveOptical Drive
Sandisk Ultra II 960GB 2 x Intel 530 SSD 2 x 3TB HDD LG BD-R 
CoolingOSMonitorPower
Noctua NH-D15 Windows 10 Home Dell 27" 1080p Seasonic Prime 750W Titanium 
CaseMouse
Fractal Define R5 Razer DeathAdder 
CPUMotherboardGraphicsRAM
i7 2600K @4.6GHz @1.4V Gigabyte GA-Z68-D3H-B3 AMD RX480 4x4GB GSkill RipjawsX 1600 CL8 
Hard DriveOptical DriveCoolingOS
2 X Intel 530 240GB + 4TB HDD LG BD-RW Cooler Master Hyper 212 Windows 10 
MonitorKeyboardPowerCase
Dell 27" 1080p Microsoft Seasonic Prime 750W Titanium Fractal Define R5 
Mouse
Razer DeathAdder 
  hide details  
Reply
     
CPUMotherboardGraphicsRAM
7700K Delid @5.1GHz @1.4V Asus Z270F Strix Asus RX480 Strix @ 1400MHz Corsair Vengance PC3200 2x8GB 
Hard DriveHard DriveHard DriveOptical Drive
Sandisk Ultra II 960GB 2 x Intel 530 SSD 2 x 3TB HDD LG BD-R 
CoolingOSMonitorPower
Noctua NH-D15 Windows 10 Home Dell 27" 1080p Seasonic Prime 750W Titanium 
CaseMouse
Fractal Define R5 Razer DeathAdder 
CPUMotherboardGraphicsRAM
i7 2600K @4.6GHz @1.4V Gigabyte GA-Z68-D3H-B3 AMD RX480 4x4GB GSkill RipjawsX 1600 CL8 
Hard DriveOptical DriveCoolingOS
2 X Intel 530 240GB + 4TB HDD LG BD-RW Cooler Master Hyper 212 Windows 10 
MonitorKeyboardPowerCase
Dell 27" 1080p Microsoft Seasonic Prime 750W Titanium Fractal Define R5 
Mouse
Razer DeathAdder 
  hide details  
Reply
post #3 of 10
Thread Starter 
After reading and Info thread on Intel Speedstep throttling, I wonder if throttlewatch can detect TM1 throttling as it is just inserting idle and not actually slowing the processor down...

Still the wouldn't explain why GPU performance is so low. The processor is below 60C for 3DMark & the games I'm using to test. And some idles shouldn't affect the frame rates as these aren't CPU bound workloads.
     
CPUMotherboardGraphicsRAM
7700K Delid @5.1GHz @1.4V Asus Z270F Strix Asus RX480 Strix @ 1400MHz Corsair Vengance PC3200 2x8GB 
Hard DriveHard DriveHard DriveOptical Drive
Sandisk Ultra II 960GB 2 x Intel 530 SSD 2 x 3TB HDD LG BD-R 
CoolingOSMonitorPower
Noctua NH-D15 Windows 10 Home Dell 27" 1080p Seasonic Prime 750W Titanium 
CaseMouse
Fractal Define R5 Razer DeathAdder 
CPUMotherboardGraphicsRAM
i7 2600K @4.6GHz @1.4V Gigabyte GA-Z68-D3H-B3 AMD RX480 4x4GB GSkill RipjawsX 1600 CL8 
Hard DriveOptical DriveCoolingOS
2 X Intel 530 240GB + 4TB HDD LG BD-RW Cooler Master Hyper 212 Windows 10 
MonitorKeyboardPowerCase
Dell 27" 1080p Microsoft Seasonic Prime 750W Titanium Fractal Define R5 
Mouse
Razer DeathAdder 
  hide details  
Reply
     
CPUMotherboardGraphicsRAM
7700K Delid @5.1GHz @1.4V Asus Z270F Strix Asus RX480 Strix @ 1400MHz Corsair Vengance PC3200 2x8GB 
Hard DriveHard DriveHard DriveOptical Drive
Sandisk Ultra II 960GB 2 x Intel 530 SSD 2 x 3TB HDD LG BD-R 
CoolingOSMonitorPower
Noctua NH-D15 Windows 10 Home Dell 27" 1080p Seasonic Prime 750W Titanium 
CaseMouse
Fractal Define R5 Razer DeathAdder 
CPUMotherboardGraphicsRAM
i7 2600K @4.6GHz @1.4V Gigabyte GA-Z68-D3H-B3 AMD RX480 4x4GB GSkill RipjawsX 1600 CL8 
Hard DriveOptical DriveCoolingOS
2 X Intel 530 240GB + 4TB HDD LG BD-RW Cooler Master Hyper 212 Windows 10 
MonitorKeyboardPowerCase
Dell 27" 1080p Microsoft Seasonic Prime 750W Titanium Fractal Define R5 
Mouse
Razer DeathAdder 
  hide details  
Reply
post #4 of 10
interesting topic, plz keep us updated. Its very interesting that the GPU performance is dictated by the FSB
    
CPUMotherboardGraphicsRAM
E6600 Evga 680i 880gts 320mb GSkill 6400 2g 
Hard DriveOSMonitorPower
10,000 rpm Raptor + 400g Seagate XP Professional 22 inch Sceptre Widescreen 750w ? 
CaseMouse
Antec P180 G5 gaming mouse 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
E6600 Evga 680i 880gts 320mb GSkill 6400 2g 
Hard DriveOSMonitorPower
10,000 rpm Raptor + 400g Seagate XP Professional 22 inch Sceptre Widescreen 750w ? 
CaseMouse
Antec P180 G5 gaming mouse 
  hide details  
Reply
post #5 of 10
interesting keep us updated
My love machine
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2.9 MacBook Intel HD Graphics 4000 1536 MB 8GB DDR3 
Hard DriveOSMonitorPower
512 SSD OSX El Capitan 13.3" 60W 
Case
MacBook 
  hide details  
Reply
My love machine
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2.9 MacBook Intel HD Graphics 4000 1536 MB 8GB DDR3 
Hard DriveOSMonitorPower
512 SSD OSX El Capitan 13.3" 60W 
Case
MacBook 
  hide details  
Reply
post #6 of 10
Thread Starter 
Ok, here's my updated testing:

8X370 – 2613
8X360 – 4437
8X350 – 4420
8X333, 5:4 memory - 4388

7X400 – 2613
7X380 – 2597
7X370 – 2593
6X370 – 2561
7X350 – 4351

Something screwy is going on above 360 FSB!! I guess I'll try more NB voltage next, but the system is perfect stable under through all of these test so far. GPU performance just drops...

I'll send a message to ASUS technical help and see what they can decipher.
     
CPUMotherboardGraphicsRAM
7700K Delid @5.1GHz @1.4V Asus Z270F Strix Asus RX480 Strix @ 1400MHz Corsair Vengance PC3200 2x8GB 
Hard DriveHard DriveHard DriveOptical Drive
Sandisk Ultra II 960GB 2 x Intel 530 SSD 2 x 3TB HDD LG BD-R 
CoolingOSMonitorPower
Noctua NH-D15 Windows 10 Home Dell 27" 1080p Seasonic Prime 750W Titanium 
CaseMouse
Fractal Define R5 Razer DeathAdder 
CPUMotherboardGraphicsRAM
i7 2600K @4.6GHz @1.4V Gigabyte GA-Z68-D3H-B3 AMD RX480 4x4GB GSkill RipjawsX 1600 CL8 
Hard DriveOptical DriveCoolingOS
2 X Intel 530 240GB + 4TB HDD LG BD-RW Cooler Master Hyper 212 Windows 10 
MonitorKeyboardPowerCase
Dell 27" 1080p Microsoft Seasonic Prime 750W Titanium Fractal Define R5 
Mouse
Razer DeathAdder 
  hide details  
Reply
     
CPUMotherboardGraphicsRAM
7700K Delid @5.1GHz @1.4V Asus Z270F Strix Asus RX480 Strix @ 1400MHz Corsair Vengance PC3200 2x8GB 
Hard DriveHard DriveHard DriveOptical Drive
Sandisk Ultra II 960GB 2 x Intel 530 SSD 2 x 3TB HDD LG BD-R 
CoolingOSMonitorPower
Noctua NH-D15 Windows 10 Home Dell 27" 1080p Seasonic Prime 750W Titanium 
CaseMouse
Fractal Define R5 Razer DeathAdder 
CPUMotherboardGraphicsRAM
i7 2600K @4.6GHz @1.4V Gigabyte GA-Z68-D3H-B3 AMD RX480 4x4GB GSkill RipjawsX 1600 CL8 
Hard DriveOptical DriveCoolingOS
2 X Intel 530 240GB + 4TB HDD LG BD-RW Cooler Master Hyper 212 Windows 10 
MonitorKeyboardPowerCase
Dell 27" 1080p Microsoft Seasonic Prime 750W Titanium Fractal Define R5 
Mouse
Razer DeathAdder 
  hide details  
Reply
post #7 of 10
Thread Starter 
Ok, I made a break-though.

8X375 with Vnb set to 1.45V - 4455!

So the northbridge core needed more voltage I guess? That is odd that is was still stable but cut back performance. Or it could be that I did 375, when I should have done 370 FSB to do an apples to apples comparison...
I report back when I confirm it was the Vnb.
     
CPUMotherboardGraphicsRAM
7700K Delid @5.1GHz @1.4V Asus Z270F Strix Asus RX480 Strix @ 1400MHz Corsair Vengance PC3200 2x8GB 
Hard DriveHard DriveHard DriveOptical Drive
Sandisk Ultra II 960GB 2 x Intel 530 SSD 2 x 3TB HDD LG BD-R 
CoolingOSMonitorPower
Noctua NH-D15 Windows 10 Home Dell 27" 1080p Seasonic Prime 750W Titanium 
CaseMouse
Fractal Define R5 Razer DeathAdder 
CPUMotherboardGraphicsRAM
i7 2600K @4.6GHz @1.4V Gigabyte GA-Z68-D3H-B3 AMD RX480 4x4GB GSkill RipjawsX 1600 CL8 
Hard DriveOptical DriveCoolingOS
2 X Intel 530 240GB + 4TB HDD LG BD-RW Cooler Master Hyper 212 Windows 10 
MonitorKeyboardPowerCase
Dell 27" 1080p Microsoft Seasonic Prime 750W Titanium Fractal Define R5 
Mouse
Razer DeathAdder 
  hide details  
Reply
     
CPUMotherboardGraphicsRAM
7700K Delid @5.1GHz @1.4V Asus Z270F Strix Asus RX480 Strix @ 1400MHz Corsair Vengance PC3200 2x8GB 
Hard DriveHard DriveHard DriveOptical Drive
Sandisk Ultra II 960GB 2 x Intel 530 SSD 2 x 3TB HDD LG BD-R 
CoolingOSMonitorPower
Noctua NH-D15 Windows 10 Home Dell 27" 1080p Seasonic Prime 750W Titanium 
CaseMouse
Fractal Define R5 Razer DeathAdder 
CPUMotherboardGraphicsRAM
i7 2600K @4.6GHz @1.4V Gigabyte GA-Z68-D3H-B3 AMD RX480 4x4GB GSkill RipjawsX 1600 CL8 
Hard DriveOptical DriveCoolingOS
2 X Intel 530 240GB + 4TB HDD LG BD-RW Cooler Master Hyper 212 Windows 10 
MonitorKeyboardPowerCase
Dell 27" 1080p Microsoft Seasonic Prime 750W Titanium Fractal Define R5 
Mouse
Razer DeathAdder 
  hide details  
Reply
post #8 of 10
I see so it's better to do by tenths?
My love machine
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2.9 MacBook Intel HD Graphics 4000 1536 MB 8GB DDR3 
Hard DriveOSMonitorPower
512 SSD OSX El Capitan 13.3" 60W 
Case
MacBook 
  hide details  
Reply
My love machine
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2.9 MacBook Intel HD Graphics 4000 1536 MB 8GB DDR3 
Hard DriveOSMonitorPower
512 SSD OSX El Capitan 13.3" 60W 
Case
MacBook 
  hide details  
Reply
post #9 of 10
Could it possibly have something to do with your RAM since FSB affects the RAM too? I know the #s are higher, but you never know what might happen when you OC right?
post #10 of 10
Thread Starter 
I suppose it could have something to do with the RAM, but it seems more likely to do with the PCIe bridge part of the northbridge since it only affected GPU performance. Plus my RAM is rated for 400Mhz 4-4-4-12 timings (XMS2). I had the ram voltage at 2.1V for some of these tests and it had no affect.

Splatoon, I really think it was increasing Vnb from 1.25V(Auto) to 1.45V that solved it. Although it could be something weird like the motherboard likes odd number FSBs better than even number above 360MHz.... I doubt it and can test that one out.
     
CPUMotherboardGraphicsRAM
7700K Delid @5.1GHz @1.4V Asus Z270F Strix Asus RX480 Strix @ 1400MHz Corsair Vengance PC3200 2x8GB 
Hard DriveHard DriveHard DriveOptical Drive
Sandisk Ultra II 960GB 2 x Intel 530 SSD 2 x 3TB HDD LG BD-R 
CoolingOSMonitorPower
Noctua NH-D15 Windows 10 Home Dell 27" 1080p Seasonic Prime 750W Titanium 
CaseMouse
Fractal Define R5 Razer DeathAdder 
CPUMotherboardGraphicsRAM
i7 2600K @4.6GHz @1.4V Gigabyte GA-Z68-D3H-B3 AMD RX480 4x4GB GSkill RipjawsX 1600 CL8 
Hard DriveOptical DriveCoolingOS
2 X Intel 530 240GB + 4TB HDD LG BD-RW Cooler Master Hyper 212 Windows 10 
MonitorKeyboardPowerCase
Dell 27" 1080p Microsoft Seasonic Prime 750W Titanium Fractal Define R5 
Mouse
Razer DeathAdder 
  hide details  
Reply
     
CPUMotherboardGraphicsRAM
7700K Delid @5.1GHz @1.4V Asus Z270F Strix Asus RX480 Strix @ 1400MHz Corsair Vengance PC3200 2x8GB 
Hard DriveHard DriveHard DriveOptical Drive
Sandisk Ultra II 960GB 2 x Intel 530 SSD 2 x 3TB HDD LG BD-R 
CoolingOSMonitorPower
Noctua NH-D15 Windows 10 Home Dell 27" 1080p Seasonic Prime 750W Titanium 
CaseMouse
Fractal Define R5 Razer DeathAdder 
CPUMotherboardGraphicsRAM
i7 2600K @4.6GHz @1.4V Gigabyte GA-Z68-D3H-B3 AMD RX480 4x4GB GSkill RipjawsX 1600 CL8 
Hard DriveOptical DriveCoolingOS
2 X Intel 530 240GB + 4TB HDD LG BD-RW Cooler Master Hyper 212 Windows 10 
MonitorKeyboardPowerCase
Dell 27" 1080p Microsoft Seasonic Prime 750W Titanium Fractal Define R5 
Mouse
Razer DeathAdder 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Intel - General
Overclock.net › Forums › Intel › Intel - General › Higher FSB, lower GPU performance?