Overclock.net › Forums › Intel › Intel CPUs › Calculations per second! Am I understand this right?
New Posts  All Forums:Forum Nav:

Calculations per second! Am I understand this right?

post #1 of 3
Thread Starter 
Modern CPUs on average run at about 3GHZ a second, I know that means 3 Billion calculations per second but what does a calculation consist of?? Is it a single calculation of for example 1+1=2 per clock cycle?

Also does this mean that a quad Core 3GHz CPU theoraticaly does 12 Billion calculations per second??
post #2 of 3
Quote:
Originally Posted by jcrew3002 View Post

Modern CPUs on average run at about 3GHZ a second, I know that means 3 Billion calculations per second but what does a calculation consist of?? Is it a single calculation of for example 1+1=2 per clock cycle?

Also does this mean that a quad Core 3GHz CPU theoraticaly does 12 Billion calculations per second??

One Hertz (Hz) is one cycle. It is related to but does not determine calculations, which are often measured in IPCs, or instructions per cycle. Assume a quad-core 3GHz CPU. If each core can perform 100 calculations per cycle, then you've got 300 billions calculations per second per core, or 1.2 trillion for the entire CPU. If they take 100 cycles to perform a single calculation, then they can only hit 30 million per core or 120 million overall. This assumes a perfect world with multi-threading, no latency, etc.
Triumvirate
(20 items)
 
Osmium
(8 items)
 
EleMINT 24
(8 items)
 
CPUMotherboardGraphicsGraphics
Xeon E3-1226 v3 ASRock Z97M OC Formula Sapphire RX 480 (reference) MSI Low-Profile 750Ti 
RAMRAMHard DriveHard Drive
Kingston Blu Red - 2x4GB ADATA XPG - 2x4GB Crucial M500 960GB Samsung 840 250GB 
Hard DriveCoolingCoolingCooling
WD Scorpio Blue 1TB Cooler Master 212+ PNY Quadro 600 blower Corsair H55 + Kraken G10 
OSMonitorMonitorKeyboard
Windows 10 Pro ASUS VE247H - 1080p Gateway FPD1960 - 1280x1024 Rosewill RK9000I - Cherry MX Blue 
PowerCaseMouseOther
Rosewill HIVE 650W Fractal Design Arc Mini R2 Razer DeathAdder 2013 CyberPower 1500PFCLCD 
CPUMotherboardRAMHard Drive
AMD A10-7870K ASRock FM2A88X-ITX+ G.Skill Ripjaws X - 2x4GB @ 2400MT/s Samsung 840 120GB 
CoolingOSPowerCase
Evercool EC-HPS-810CP Windows 7 Pro 64-bit PicoPSU-120-WI-25 Mini-Box M350 
CPUMotherboardGraphicsRAM
Intel i3-4005U OEM Intel HD 4200 4GB DDR3 (soldered) 
Hard DriveOSMonitorPower
MyDigitalSSD Super Boot Eco 120GB Linux Mint 17.1 Cinnamon 1366x768 TN panel :'( brick 
  hide details  
Reply
Triumvirate
(20 items)
 
Osmium
(8 items)
 
EleMINT 24
(8 items)
 
CPUMotherboardGraphicsGraphics
Xeon E3-1226 v3 ASRock Z97M OC Formula Sapphire RX 480 (reference) MSI Low-Profile 750Ti 
RAMRAMHard DriveHard Drive
Kingston Blu Red - 2x4GB ADATA XPG - 2x4GB Crucial M500 960GB Samsung 840 250GB 
Hard DriveCoolingCoolingCooling
WD Scorpio Blue 1TB Cooler Master 212+ PNY Quadro 600 blower Corsair H55 + Kraken G10 
OSMonitorMonitorKeyboard
Windows 10 Pro ASUS VE247H - 1080p Gateway FPD1960 - 1280x1024 Rosewill RK9000I - Cherry MX Blue 
PowerCaseMouseOther
Rosewill HIVE 650W Fractal Design Arc Mini R2 Razer DeathAdder 2013 CyberPower 1500PFCLCD 
CPUMotherboardRAMHard Drive
AMD A10-7870K ASRock FM2A88X-ITX+ G.Skill Ripjaws X - 2x4GB @ 2400MT/s Samsung 840 120GB 
CoolingOSPowerCase
Evercool EC-HPS-810CP Windows 7 Pro 64-bit PicoPSU-120-WI-25 Mini-Box M350 
CPUMotherboardGraphicsRAM
Intel i3-4005U OEM Intel HD 4200 4GB DDR3 (soldered) 
Hard DriveOSMonitorPower
MyDigitalSSD Super Boot Eco 120GB Linux Mint 17.1 Cinnamon 1366x768 TN panel :'( brick 
  hide details  
Reply
post #3 of 3
Thread Starter 
Quote:
Originally Posted by CynicalUnicorn View Post

One Hertz (Hz) is one cycle. It is related to but does not determine calculations, which are often measured in IPCs, or instructions per cycle. Assume a quad-core 3GHz CPU. If each core can perform 100 calculations per cycle, then you've got 300 billions calculations per second per core, or 1.2 trillion for the entire CPU. If they take 100 cycles to perform a single calculation, then they can only hit 30 million per core or 120 million overall. This assumes a perfect world with multi-threading, no latency, etc.

Ok good info thanks! So for example in Microsoft Word if from the pressing of the letter "A" till the time it is displayed on screen it takes only 5 cycles then at that instant the CPU is theoretically working at 20 Billion calculations per second per core per key pressed.

So the actual working speed of the CPU (time it takes to debug some program code from start to Finnish) is dependent on the program running through the CPU at 3GHz per second.

helps me to understand those CPU benchmarking programs thumb.gif
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Intel CPUs
Overclock.net › Forums › Intel › Intel CPUs › Calculations per second! Am I understand this right?