This table’s data was compiled by Fractal Forum user DLC86. Thanks!

Below is a table showing the CPU usage of each block. There are a few things to keep in mind:

  • These values are only estimates.
  • The CPU meter changes quickly, so all % are within +/- 0.1% or so.
  • These values were calculated with no audio running through the Axe-Fx III and no USB cable connected. Real-time audio and processing does increase CPU a bit.
  • Values are calculated using the hardware CPU meter, not Axe-Edit III.
  • All blocks are at Default Values for each type, unless noted in the Details column –¬†endless combinations of values could change the CPU level.
  • Approximate “CPU Limit” per preset is 90%.

As mentioned, these are just estimates. Adding numbers together that may work based off this sheet may not work on the actual unit by a few % due to many factors of running real-time processing. Some numbers move extremely quickly, so “best guess” is used at times. Again, just estimates for a general idea of CPU usage.

Click here to see the FM3 and Axe-Fx III Block CPU estimates compared

CPU usage subject to change when firmware is updated


BlockDetails12.06
Base CPU4.7
Shunt0.2
InputClassic Gate1.4
Intelligent Gate1.9
Noise Reducer1.9
Out0.8
Amp0.4
Cab
High-Res1 Cab6.6
2 Cabs12.4
3 Cabs18.2
4 Cabs24.0
Ultrares1 Cab5.4
2 Cabs9.9
3 Cabs14.4
4 Cabs18.7
ChorusDigital Mono2.9
Digital Stereo3
Analog Mono3.2
Analog Stereo3.3
Japan CE-23.2
Warm Stereo3.2
80's Style2.9
Triangle Chorus2.8
8-Voice Stereo5.9
Vintage Tape3.7
Dimension 13.1
Dimension 23.1
Dimension 33.1
4-Voice Analog3.3
8-Voice Analog6.4
Stereo Tri-Chorus2.8
Dual Chorus2.2
CompStudio Comp2.1
Pedal Comp 11
Pedal Comp 21.3
Dynamics Processor1.6
Optical Comp1.4
Tube Comp1.5
Analog Comp1.9
DynamiComp1
Crossover1.8
DelayDigital Mono2.6
Digital Stereo2.7
Analog Mono3.3
Analog Stereo3.4
Mono Tape3.6
Stereo Tape4
Ping-Pong3.5
Dual Delay3.5
Reverse Delay1.7
Sweep Delay4.5
Ducking Delay3.6
Vintage Ditigal3.5
2290 w/ Mod3.4
Ambient Stereo5.1
Deluxe Mind Guy3.3
Mono BBD3.2
Stereo BBD3.3
Lo-Fi Tape3.7
Stereo Mind Guy3.3
DriveBB Pre6
Bender Fuzz2.8
Bit Crusher4
Blackglass 7K3.9
Blues OD6
Esoteric ACB6
Esoteric RCB6
Eternal Love6
FAS Boost6
FAS LED-Drive6
FET Boost2.8
FET Preamp2.8
Face Fuzz4
Fat Rat6.1
Full OD6
Hard Fuzz2.7
Heartpedal 116
Jam Ray6
M-Zone Distortion6.2
Master Fuzz4
Micro Boost2.8
Mid Boost4
OD 2506
Octave Distortion2.9
PI Fuzz4
Plus Distortion6
Rat Distortion6
Ruckus Ge6.1
Ruckus LED6.1
Ruckus LED/Si6.1
SDD Preamp2.7
Shimmer Drive4
Shred Distortion6
Super OD6
T808 Mod6
T808 OD6
Tape Distortion3.9
Timothy 16
Timothy 26
Tone of Kings6
Treble Boost3.9
Tube Drive 3-Knob3.4
Tube Drive 4-Knob3.5
Zen Master6
EnhancerModern1.2
Classic0.6
Stereoizer0.9
FilterAll types except...0.6
FF Comb0.8
FB Comb0.9
Allpass0.9
FlangerDigital Mono2.1
Digital Stereo2.2
Analog Mono2.2
Analog Stereo2.3
Thru-Zero2.4
Stereo Jet2.2
Zero Flanger2.2
Pop Flanger2.4
MXF-1172.9
BBF-22.9
Electric Mystery2.5
Deluxe Mystery2.4
D/AD 1852.8
Manual Thru-Zero Flanger2.2
Step Flanger2.5
FAS Flanger2.2
Formant0.8
GateClassic0.7
Downward Expander1.4
GEQAll Types0.5
IR PlayerHigh-Res6.3
Ultrares5.1
LooperSpeed Full5.7
Speed Half4.1
Megatap1 Tap1.3
10 Taps2.3
25 Taps3.9
45 Taps6.4
64 Taps8.6
MIDI0.2
Mixer0.5
Multiband Comp4.3
Multiplexer1
Multitap DelayQuad-Tap3.1
Quad Parallel3.9
Quad Series3.4
Diffusor2.7
Quad Tape5.4
Quad-Tap Band3.1
PEQ0.8
PhaserDigital Mono1.6
Digital Stereo1.6
Script 451.2
Script 901.5
Block 901.5
Classic Vibe1.9
Stereo 8-Stage2.2
Barber Pole5.6 - 6.2
Stripe 901.5
Naughty Rock1.9
FAS Vibe2
Treadle Phaser1.8
Virtuoso Phaser1.8
Borg Phaser1.5
Ultra-Super-Mega Phaser2.8
Mutated Twin-Phaser1.8
PitchDual Detune3.4
Quad Detune5.8
Dual Shift5
Quad Shift9
Dual Harmony5.3
Quad Harmony9.5
Classic Whammy3.2
Octave Divider1.9
Crystal Echoes3.6
Advanced Whammy3.1
Arpeggiator3.2
Custom Shifter5.2
Quad Shift Delay8.1
Quad Harmony Delay9.6
Virtual Capo3.2
Plex DelayPlex Delay3.2
Plex Detune6.7
Plex Shift6.7
Plex Verb4.4
Shimmer Verb13.5
RTA0.2
Resonator4
Return Block0.6
Reverb
Normal, Echo Density: 8Ambience7.2
Asylum Hall7.7
Cavern7.6
Chorus Hall7.7
Cirrocumulus7.7
Concert Hall7.7
Cumulonimbus7.7
Deep Chamber7.7
Deep Space7.7
Deluxe Spring Verb6
Drum Room7.6
Gymnasium7.7
Hallway7.6
Huge Room7.7
Ice Castle7.7
Large Cathedral7.7
Large Chamber7.7
Large Deep Hall7.7
Large Hall7.7
Large Plate7.7
Large Room7.7
Large Spring5.9
Large Tiled Room7.2
Large Wooden Room7.7
London Plate7.7
Medium Cathedral7.7
Medium Chamber7.2
Medium Hall7.7
Medium Plate7.7
Medium Room7.7
Medium Spring6
Music Hall7.7
Nimbostratus7.7
North Church7.7
Recording Studio A7.2
Recording Studio C7.2
Rich Hall7.7
Small Cathedral7.6
Small Chamber7.7
Small Hall7.7
Small Plate7.7
Small Room7.3
Small Spring5.4
South Church7.7
Stone Quarry7.6
Stratocumulus7.7
Studio7.2
Sun Plate7.7
Symphony Hall7.7
Tunnel7.7
Vocal Plate7.7
Wide Hall7.7
High, Echo Density 8Ambience10
Asylum Hall10.5
Cavern10.5
Chorus Hall10.5
Cirrocumulus10.5
Concert Hall10.5
Cumulonimbus10.5
Deep Chamber10.5
Deep Space10.5
Deluxe Spring Verb6
Drum Room10.5
Gymnasium10.5
Hallway10.5
Huge Room10.5
Ice Castle10.5
Large Cathedral10.5
Large Chamber10.5
Large Deep Hall10.5
Large Hall10.5
Large Plate10.5
Large Room10.5
Large Spring5.9
Large Tiled Room10
Large Wooden Room10.5
London Plate10.5
Medium Cathedral10.5
Medium Chamber10
Medium Hall10.5
Medium Plate10.5
Medium Room10.5
Medium Spring6
Music Hall10.6
Nimbostratus10.5
North Church10.5
Recording Studio A10
Recording Studio C10
Rich Hall10.6
Small Cathedral10.5
Small Chamber10.5
Small Hall10.5
Small Plate10.4
Small Room10.1
Small Spring5.4
South Church10.5
Stone Quarry10.4
Stratocumulus10.6
Studio10
Sun Plate10.5
Symphony Hall10.4
Tunnel10.6
Vocal Plate10.5
Wide Hall10.6
Ultra High, Echo Density 8Ambience11
Asylum Hall11.5
Cavern11.5
Chorus Hall11.5
Cirrocumulus11.6
Concert Hall11.6
Cumulonimbus11.5
Deep Chamber11.6
Deep Space11.5
Deluxe Spring Verb6
Drum Room11.6
Gymnasium11.5
Hallway11.5
Huge Room11.5
Ice Castle11.5
Large Cathedral11.5
Large Chamber11.5
Large Deep Hall11.5
Large Hall11.5
Large Plate11.5
Large Room11.5
Large Spring5.9
Large Tiled Room11
Large Wooden Room11.5
London Plate11.5
Medium Cathedral11.5
Medium Chamber11.1
Medium Hall11.5
Medium Plate11.5
Medium Room11.5
Medium Spring6
Music Hall11.6
Nimbostratus11.5
North Church11.5
Recording Studio A11.1
Recording Studio C11.1
Rich Hall11.6
Small Cathedral11.5
Small Chamber11.6
Small Hall11.6
Small Plate11.5
Small Room11
Small Spring5.4
South Church11.6
Stone Quarry11.5
Stratocumulus11.6
Studio11
Sun Plate11.5
Symphony Hall11.5
Tunnel11.6
Vocal Plate11.5
Wide Hall11.6
Ring ModClassic2.3
SSB Upper2.9
SSB Lower2.9
Rotary3.3
Send Block0.2
Synth1 Voice Triangle3.3
2 Voices Triangle5
3 Voices Triangle6.7
Ten-Tap DelayTen Tap Mono2.5
Rhythm Tap Mono2.5
Ten Tap Stereo3.2
Rhythm Tap Stereo3.3
Tonematch7
TremoloTremolo0.6
Panner2.3
Bias Trem0.6
Harmonic Trem1
Optical Trem0.7
Vocoder8.1
VolumeVolume0.6
Auto-Swell0.7
WahAll types1.1