Overclock.net › Forums › Intel › Intel CPUs › Sandy Bridge Overclocking Question
New Posts  All Forums:Forum Nav:

Sandy Bridge Overclocking Question

post #1 of 23
Thread Starter 
When OC'ing SB CPU's we usually set the multi to the "Turbo Ratio" field in ASUS boards. I'm curious on how does "Turbo mode" kick in when you overclock the CPU. I mean when you set a specific multi, is that multi the multi that will kick in when ALL CORES are used? For example, for the i5-2500K you get a stock 3.4GHz when all cores are used and when a single core is used the frequency reaches up to 3.8GHz as the specs say. Does this mean that if we use a multi of 45 in the BIOS, that would be 4.5GHz? And then the frequency for single core usage will adjust accordingly by the default ratio of the CPU (higher than 4.5GHz)?
post #2 of 23
you are thinking about it too much...

the factory base clock (bus speed) for SB is 100mhz... the stock multi for the 2500k is 33 right?

that yields 3300mhz or 3.3ghz.

if you change your multi to 45, that should yield ~4500mhz or 4.5ghz

is that what you are asking?
1 of Many
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k @ 4.7ghz BIOSTAR TP67XE EVGA GTX680 2GB 2x 4GB Rip Jaws @ 1600mhz 
Hard DriveOptical DriveCoolingOS
500gb SSD & 1tb WD Black & 3tb WD Green ASUS dvd & ASUS BR Corsair H60 Windows 7 Home Premium 
MonitorKeyboardPowerCase
LG 23" 3D 120hz & ACER 23" LED 120hz Ducky Shine 3 Corsair HX750 CM Scout 
Mouse
Razer Ourobos 
  hide details  
Reply
1 of Many
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k @ 4.7ghz BIOSTAR TP67XE EVGA GTX680 2GB 2x 4GB Rip Jaws @ 1600mhz 
Hard DriveOptical DriveCoolingOS
500gb SSD & 1tb WD Black & 3tb WD Green ASUS dvd & ASUS BR Corsair H60 Windows 7 Home Premium 
MonitorKeyboardPowerCase
LG 23" 3D 120hz & ACER 23" LED 120hz Ducky Shine 3 Corsair HX750 CM Scout 
Mouse
Razer Ourobos 
  hide details  
Reply
post #3 of 23
Thread Starter 
No. That's not exactly my question.

3.3GHzis the non-turbo stock frequency. My question is about turbo mode. If 4.5GHz would be the overclocked frequency, what are the turbo frequencies?
post #4 of 23
When you set the multi to 45, that is the "turbo". It will only go up to 4.5ghz as needed. If you were to turn turbo off, it would always run at 4.5ghz. I don't recommend it however, there is no benefit.

I hope that answered your question
Be Rock Steady
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7-2600K 4.7ghz @ 1.33 ASUS P8Z68 Deluxe Titan X Corsair Vengeance 16GB PC12800 DDR3 
Hard DriveHard DriveHard DriveCooling
Corsair Force CSSD-F115GB Seagate 1tb Western Digital 3TB bare H100 
OSMonitorKeyboardPower
Windows 7 Home Premium qnix kul es-87 Cooler Master Silent Pro M850 
CaseMouseAudioAudio
Corsair Obsidian 800D Razer Deathadder BE Schiit Audio Bifrost Uber Schiit Audio Lyr 2 
Audio
Audeze LCD-2 
  hide details  
Reply
Be Rock Steady
(19 items)
 
  
CPUMotherboardGraphicsRAM
i7-2600K 4.7ghz @ 1.33 ASUS P8Z68 Deluxe Titan X Corsair Vengeance 16GB PC12800 DDR3 
Hard DriveHard DriveHard DriveCooling
Corsair Force CSSD-F115GB Seagate 1tb Western Digital 3TB bare H100 
OSMonitorKeyboardPower
Windows 7 Home Premium qnix kul es-87 Cooler Master Silent Pro M850 
CaseMouseAudioAudio
Corsair Obsidian 800D Razer Deathadder BE Schiit Audio Bifrost Uber Schiit Audio Lyr 2 
Audio
Audeze LCD-2 
  hide details  
Reply
post #5 of 23
Thread Starter 
I don't still get it. Let me reiterate the basic of Turbo Boost technology first and see if my understanding is correct. The i5-2500k's frequencies (at default 33x multi) are:

3.3GHz - non-Turbo frequency
3.4GHz - 4 cores working with Turbo kicking in
3.5GHz - 3 cores working with Turbo kicking in
3.6GHz - 2 cores working with Turbo kicking in
3.7GHz - 1 core working with Turbo kicking in

Know on an overclocked i5-2500k (at 45x multi), am I correct that it works like this:

4.5GHz - non-Turbo frequency
4.6GHz - 4 cores working with Turbo kicking in
4.7GHz - 3 cores working with Turbo kicking in
4.8GHz - 2 cores working with Turbo kicking in
4.9GHz - 1 core working with Turbo kicking in

???
post #6 of 23
Quote:
Originally Posted by kevindd992002 View Post
I don't still get it. Let me reiterate the basic of Turbo Boost technology first and see if my understanding is correct. The i5-2500k's frequencies (at default 33x multi) are:

3.3GHz - non-Turbo frequency
3.4GHz - 4 cores working with Turbo kicking in
3.5GHz - 3 cores working with Turbo kicking in
3.6GHz - 2 cores working with Turbo kicking in
3.7GHz - 1 core working with Turbo kicking in

Know on an overclocked i5-2500k (at 45x multi), am I correct that it works like this:

4.5GHz - non-Turbo frequency
4.6GHz - 4 cores working with Turbo kicking in
4.7GHz - 3 cores working with Turbo kicking in
4.8GHz - 2 cores working with Turbo kicking in
4.9GHz - 1 core working with Turbo kicking in

???
That is a very good way of looking at it.What is your Vcore if I may ask?
Dante's Inferno
(28 items)
 
Paradise Lost
(17 items)
 
 
CPUMotherboardGraphicsGraphics
i5 2500k 4.7 GHz Asrock P67 Extreme 4 Gen 3 BIOS 2.10 XFX Radeon HD 6950 2GB  XFX Radeon HD 6950 2GB  
RAMHard DriveHard DriveHard Drive
G Skill Sniper 8 Gigs 1600 MHz Crucial M4 64GB SATA III  Seagate Barracuda 1TB 7200 RPM Seagate Barracuda 1TB 7200 RPM  
Hard DriveOptical DriveOptical DriveCooling
Seagate Backup Plus 1TB USB 3.0 LITE-ON 24X DVD/CD LITE-ON 24X DVD/CD 5,000 BTU AC & NH-D14 Summer 
CoolingOSMonitorKeyboard
80 CFM Fan In Window With 90 Deg Vent Winter Windows 7 Ultimate SP 1 x64 Asus VE245 1080P Razer Lycosa Mirror Edition 
PowerCaseMouseMouse Pad
1200 Watt Antec True Power Quattro Corsair 800D 8 Fans Full Blast Razer Abyssus Razer Vespula 
AudioAudioAudioOther
7.1 CH HD Audio With THX TruStudio™ Logitech H390 USB Headset Logitech 5.1 X-530 & Sony MDR-V150 Dynamic Ster... Rheobus Extreme 6 Speed Fan Controller 
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E4400 2 GHz Intel D946GZIS On Board 3 Gig's Kingston PC2-5300 
Hard DriveOptical DriveCoolingOS
Western Digital 160 Gig Writemaster DVD/CD R&W Stock Intel Windows Vista SP 2 x86 
MonitorKeyboardPowerCase
I-INC iF171A HP KB-0316 BFG 450 Watt Black 
MouseMouse PadAudioAudio
Microsoft Intellimouse Explorer 3.0 Dasher Tt On Board Logitech Z130 
Audio
Logitech H390 USB Headset 
  hide details  
Reply
Dante's Inferno
(28 items)
 
Paradise Lost
(17 items)
 
 
CPUMotherboardGraphicsGraphics
i5 2500k 4.7 GHz Asrock P67 Extreme 4 Gen 3 BIOS 2.10 XFX Radeon HD 6950 2GB  XFX Radeon HD 6950 2GB  
RAMHard DriveHard DriveHard Drive
G Skill Sniper 8 Gigs 1600 MHz Crucial M4 64GB SATA III  Seagate Barracuda 1TB 7200 RPM Seagate Barracuda 1TB 7200 RPM  
Hard DriveOptical DriveOptical DriveCooling
Seagate Backup Plus 1TB USB 3.0 LITE-ON 24X DVD/CD LITE-ON 24X DVD/CD 5,000 BTU AC & NH-D14 Summer 
CoolingOSMonitorKeyboard
80 CFM Fan In Window With 90 Deg Vent Winter Windows 7 Ultimate SP 1 x64 Asus VE245 1080P Razer Lycosa Mirror Edition 
PowerCaseMouseMouse Pad
1200 Watt Antec True Power Quattro Corsair 800D 8 Fans Full Blast Razer Abyssus Razer Vespula 
AudioAudioAudioOther
7.1 CH HD Audio With THX TruStudio™ Logitech H390 USB Headset Logitech 5.1 X-530 & Sony MDR-V150 Dynamic Ster... Rheobus Extreme 6 Speed Fan Controller 
CPUMotherboardGraphicsRAM
Intel Core 2 Duo E4400 2 GHz Intel D946GZIS On Board 3 Gig's Kingston PC2-5300 
Hard DriveOptical DriveCoolingOS
Western Digital 160 Gig Writemaster DVD/CD R&W Stock Intel Windows Vista SP 2 x86 
MonitorKeyboardPowerCase
I-INC iF171A HP KB-0316 BFG 450 Watt Black 
MouseMouse PadAudioAudio
Microsoft Intellimouse Explorer 3.0 Dasher Tt On Board Logitech Z130 
Audio
Logitech H390 USB Headset 
  hide details  
Reply
post #7 of 23
Thread Starter 
Quote:
Originally Posted by langer1972 View Post
That is a very good way of looking at it.What is your Vcore if I may ask?
Thanks for the confirmation. I'm just a newbie in overclocking and when I set my multi to 45x, my Vcore is around 1.3V as set to Auto in the BIOS. I have to fiddle with it more this weekend. I've just noticed that when I stress tested using OCCT while OCd at 45x, why didn't the frequency in CPUZ reach 4.6GHz? At stock multi I saw it stay at 3.4GHz.
post #8 of 23
Quote:
Originally Posted by kevindd992002 View Post
Thanks for the confirmation. I'm just a newbie in overclocking and when I set my multi to 45x, my Vcore is around 1.3V as set to Auto in the BIOS. I have to fiddle with it more this weekend. I've just noticed that when I stress tested using OCCT while OCd at 45x, why didn't the frequency in CPUZ reach 4.6GHz? At stock multi I saw it stay at 3.4GHz.
It doesn't work that way. Once you take the CPU off of Auto, the extra turbo frequencies go away. If you set the Turbo multiplyer to 45 (and that is what you are setting in the UEFI) your processor will max out at 4.5ghz (assuming a 100Bclk) on all cores. By manually setting the Turbo frequency, you have overridden the 1-4 core turbo speeds you reference, that are built into the CPU.

In this senario, the CPU will typically run at 1.6Ghz (non-turbo speed/speedstep enabled) or 4.5Ghz (Turbo Mode). If you disable speedstep, the CPU will always run at 4.5Ghz.
Edited by xandypx - 10/25/11 at 7:35am
Rusty Metal
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 2600K ASUS P8P67 PRO NVIDIA GeForce GTX 580 Corsair Vengeance 
Hard DriveHard DriveHard DriveOptical Drive
2 x Corsair Performance 3 SSD 128 GB; RAID 0 2 x Western Digital Black 1TB; RAID 0 Western Digital Black LG BluRay - RE/DVD+/-DL Burner  
Optical DriveCoolingOSMonitor
LG 24x super-multi  Corsair H70 Windows 7 Professional x64 DELL U2711 
KeyboardPowerCaseMouse
logitech G19 Corsair AX750 Coolermaster Storm Sniper Logitech Performance MX 
Audio
Creative Sound Blaster X-Fi Titanium Fatal1ty Pro  
  hide details  
Reply
Rusty Metal
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 2600K ASUS P8P67 PRO NVIDIA GeForce GTX 580 Corsair Vengeance 
Hard DriveHard DriveHard DriveOptical Drive
2 x Corsair Performance 3 SSD 128 GB; RAID 0 2 x Western Digital Black 1TB; RAID 0 Western Digital Black LG BluRay - RE/DVD+/-DL Burner  
Optical DriveCoolingOSMonitor
LG 24x super-multi  Corsair H70 Windows 7 Professional x64 DELL U2711 
KeyboardPowerCaseMouse
logitech G19 Corsair AX750 Coolermaster Storm Sniper Logitech Performance MX 
Audio
Creative Sound Blaster X-Fi Titanium Fatal1ty Pro  
  hide details  
Reply
post #9 of 23
Thread Starter 
Quote:
Originally Posted by xandypx View Post
It doesn't work that way. Once you take the CPU off of Auto, the extra turbo frequencies go away. If you set the Turbo multiplyer to 45 (and that is what you are setting in the UEFI) your processor will max out at 4.5ghz (assuming a 100Bclk) on all cores. By manually setting the Turbo frequency, you have overridden the 1-4 core turbo speeds you reference, that are built into the CPU.

In this senario, the CPU will typically run at 1.6Ghz (non-turbo speed/speedstep enabled) or 4.5Ghz (Turbo Mode). If you disable speedstep, the CPU will always run at 4.5Ghz.
Oh ok, so basically when overlocked the CPU is only hovering between two basic frequencies, 1.6GHz and 4.5GHz? So when you set the Turbo Ratio to your desired multi, you lose the Turbo Boost technology of the CPU and it runs just like just like the old Q6600 quad core CPUs?
post #10 of 23
dbl post
Rusty Metal
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 2600K ASUS P8P67 PRO NVIDIA GeForce GTX 580 Corsair Vengeance 
Hard DriveHard DriveHard DriveOptical Drive
2 x Corsair Performance 3 SSD 128 GB; RAID 0 2 x Western Digital Black 1TB; RAID 0 Western Digital Black LG BluRay - RE/DVD+/-DL Burner  
Optical DriveCoolingOSMonitor
LG 24x super-multi  Corsair H70 Windows 7 Professional x64 DELL U2711 
KeyboardPowerCaseMouse
logitech G19 Corsair AX750 Coolermaster Storm Sniper Logitech Performance MX 
Audio
Creative Sound Blaster X-Fi Titanium Fatal1ty Pro  
  hide details  
Reply
Rusty Metal
(17 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7 2600K ASUS P8P67 PRO NVIDIA GeForce GTX 580 Corsair Vengeance 
Hard DriveHard DriveHard DriveOptical Drive
2 x Corsair Performance 3 SSD 128 GB; RAID 0 2 x Western Digital Black 1TB; RAID 0 Western Digital Black LG BluRay - RE/DVD+/-DL Burner  
Optical DriveCoolingOSMonitor
LG 24x super-multi  Corsair H70 Windows 7 Professional x64 DELL U2711 
KeyboardPowerCaseMouse
logitech G19 Corsair AX750 Coolermaster Storm Sniper Logitech Performance MX 
Audio
Creative Sound Blaster X-Fi Titanium Fatal1ty Pro  
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Intel CPUs
Overclock.net › Forums › Intel › Intel CPUs › Sandy Bridge Overclocking Question