The Miller Spectrum 625 X-TREME is the better plasma cutter overall, rated 3.6 to 3.3. The Miller Spectrum 625 X-TREME leads on cut and duty cycle. The Forney 40 P costs $877.92 less ($1,630.08 vs $2,508).
A light, dual voltage Miller cutter for shops and job sites that cut up to 5/8 in steel day after day. Worth it for buyers who value Miller build and dealer service; hobby users can pay much less.
Amazon $2,917.20 Cyberweld $2,508For buyers who want a Forney machine with US phone support for 1/2 in steel on either voltage. On price alone, other dual voltage pilot arc cutters do the same work for far less.
Amazon $1,630.08Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Each factor is scored 0-100 against the same fixed reference points for every up to 45 A plasma cutter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Miller Spectrum 625 X-TREME | Forney 40 P |
|---|---|---|
| Overall rating | 3.6/5 | 3.3/5 |
| Value 30% | 23 $4,012.80 per inch of rated cut ($2,508, 5/8 in) | 30 $3,260.16 per inch of rated cut ($1,630.08, 1/2 in) |
| Cut 20% | 75 5/8 in rated cut on mild steel | 50 1/2 in rated cut on mild steel |
| Duty cycle 15% | 100 60% at full output (40 A) | 75 50% at full output (40 A) |
| Pilot arc 10% | 100 pilot arc | 100 pilot arc |
| Warranty 25% | 50 3-year warranty on the machine | 50 3-year warranty on the machine |
| Miller Spectrum 625 X-TREME | Forney 40 P | |
|---|---|---|
| Cutting | ||
| Input voltage | 120/240 V | 120/240 V |
| Maximum output | 40 A | 40 A |
| Rated cut, mild steel | 5/8 in | 1/2 in |
| Sever cut, mild steel | 7/8 in | 3/4 in |
| Rated duty cycle | 60% at 40 A, 40 °C | 50% at 40 A |
| Pilot arc | Yes | Yes |
| Air and build | ||
| Air supply | 6 cfm, 90 psi | 4.5 cfm, 90 psi |
| Weight | 21 lb | 30 lb |
| Warranty | 3 years | 3 years |
| Released | 2011-11 | - |
