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multi-tasking lowered my cpu usage?

May 27, 2008
Huddersfield, uk
Processor E8200
Motherboard Asus P5KC
Cooling cooler master hyper tx3, 2x 120mm, 1x 80mm
Memory 4 GB DDR3 OCZ Black Edition
Video Card(s) Gigabyte HD 2600xt silent pipe II
Storage 500GB WD Sata / 60 GB Samsung IDE
Display(s) 20" samusng LCD, gaming at 1680 x 1050
Case some old amd thing
Audio Device(s) onboard
Power Supply 650W
Software Windows 8.1, with 'start is back' obviously
Benchmark Scores It boots whilst im still young so im pleased with that.
well i was using ConvertXToDvd to encode some films ive got to burn to dvd an that was using 70% ish of my cpu, now i thought well ill pop in one of my games to turn into an iso. Loaded up the program started to make the iso an my cpu usage dropped to 50% max 55. Im just a little confused shouldnt this use up more of my cpu or is there a setting somewhere to stop my cpu being maxed out, like some sort of energy saver?


New Member
May 15, 2006
Processor I7 920 @ 3GHz
Motherboard Asus p6td Deluxe
Cooling stock intel
Memory 6gb Dominator @ 1600MHz
Video Card(s) hd5870 and gts250 for folding an physx
Storage 2x wd 512Gb in raid0, 1x 1Tb wd
Display(s) Samsung P2450H
Case Corsair Obsidian 800D
Audio Device(s) Creative X-FI Titanium FATAL1TY
Power Supply Corsair tx850
Software Windows 7 Professional
Did you see how much memory you were using? Maybe you ran out of memory and the applications slowed down because they had to use the hdd as ram as well. The cpu clock multiplier is often lowered to save power, but only when the computer is idle. If the multiplier was lowered when you were preforming those tasks, the cpu usage would probably been shown as even higher in task manager.
May 4, 2009
System Name penguin
Processor i3-4160
Motherboard Asus H81 Mini-ITX
Cooling Stock
Memory 2x4GB Kingston 1600MHz
Video Card(s) Saphire Radeon 7850 2GB
Storage Plextor M5S 120GB+1TB Seagate
Display(s) 23' Dell
Case CM Elite 130
Audio Device(s) stock
Power Supply Corsair CX430m
Software W7/Lubuntu
Maybe your encoder has some function selected like background encoding - meaning that it's a low priority task. You could check through the program's settings or try setting the encoder at a higher affinity in the task manager.
Sep 30, 2009
Oh Canada!
System Name Storm Force / Tribulation / Soul Fire
Processor Intel 9550 / Phenom II 965 / Phenom II 810
Motherboard Gigabyte Extreme EP45 / M4T785TD-V Evo / EVO mATX
Cooling Zalman CNPS10X Extreme / ZeroTherm Nirvana / Spire Thermax
Memory 2x2 Corsair Dominator PC8500 / G.Skill 1600 RipJaws / 4x1 Binned Crucial 1600
Video Card(s) ASUS ENGTX260 Matrix / eVGA 9800GX2 SSC , eVGA 9800GT / PNY XL8R 9800GX2
Storage WD640 Black, WD320 Blue / Hitachi Deskstar 80GB / WD V300
Display(s) Samsung 2043CNPX
Case NZXT Lexa S / CM Storm Scout / CM Blue 310 Elite
Audio Device(s) None Required
Power Supply Ultra X3 850W / Corsair HX750W / Silverstone Strider Plus 750W
Software Windows XP SP3 32Bit X3
Another possibility is that when running one task you were using 70% of a single CPU Core and when you started working on something else the other cores kicked in to spread the work load.