The single deciding factor between the DeWalt DWS779 and the DeWalt DWS780 is the presence of an integrated XPS LED shadow cutline alignment system alongside a nearly ten-pound difference in carrying weight.
Choose the DWS779 if you want heavy-duty cutting capacity for structural framing and general carpentry without paying extra for an integrated guide light. Choose the DWS780 if you do detailed finish carpentry and cabinetry where rapid, adjustment-free cutline alignment speeds up your daily workflow.
DeWalt DWS779 vs DWS780 at a Glance
| Feature | DeWalt DWS779 | DeWalt DWS780 |
|---|---|---|
| Motor Power | 15 Amp, 3,800 RPM | 15 Amp (1100W / 1675W), 3,800 RPM |
| Blade Diameter and Teeth | 12-Inch, 80-Tooth Carbide | 12-Inch, 80-Tooth |
| Cutline Indicator | Not listed | Integrated XPS LED Shadow Line |
| Maximum 90° Crosscut | 2 x 14 dimensional lumber | 2 x 14 dimensional lumber |
| Maximum 45° Miter Cut | 2 x 10 dimensional lumber | 2 x 10 dimensional lumber |
| Crown Molding Capacity | 7-1/2 in. nested | 7-1/2 in. nested |
| Base Molding Capacity | 6-3/4 in. vertical | 6-3/4 in. vertical |
| Miter Angle Range | 60° Right / 50° Left | 60° Right / 50° Left |
| Bevel Angle Range | 49° Right / 49° Left | 49° Right / 49° Left |
| Listed Weight | 67.7 pounds | 58 pounds (24.8 kg) |
| Best For | Framing, rough carpentry, workshop setups | Finish carpentry, trim installation, jobsite transport |
Cutline Alignment and Accuracy Systems
A dependable cutline marker changes how quickly you can line up timber against a spinning carbide blade. Finish carpenters making hundreds of trim joints per day rely on an exact visual reference to eliminate marking errors. When working with delicate moldings, sighting down the blade teeth manually forces you to lower the unpowered head repeatedly to verify contact points, slowing down repetitive tasks.
In this dewalt dws779 vs bosch gcm12sd comparison space, the DWS779 vs DWS780 cutline system represents the primary functional divergence. The DWS780 includes a factory-integrated XPS LED shadow light system that casts a dark shadow of the blade directly onto the work surface. Because it projects the actual shadow of the kerf, the line matches blade thickness exactly and never requires manual calibration, even after blade swaps. The DWS779 does not include a shadow light or laser guide from the factory. While some woodworkers research an aftermarket DWS780 XPS light upgrade to retrofit the DWS779, the DWS780 provides this capability out of the box with zero workshop modifications required.
For fine woodworking, having an adjustment-free kerf projection reduces setup errors on expensive hardwoods. The lack of an onboard alignment system on the DWS779 means relying purely on pencil lines and mechanical blade contact. When considering the DWS779 or DWS780 for trim work, having the XPS system ready on day one makes cutting complex angles noticeably faster.
Edge: DeWalt DWS780 because its integrated XPS shadow line system offers immediate, calibration-free kerf alignment straight out of the box.
Tool Weight and Portability
Sliding compound miter saws are notoriously bulky shop tools, and carrying them between vehicles and upper-floor workspaces can take a physical toll. A lighter chassis makes a significant difference for solo remodelers and mobile framing crews who load equipment daily. At the same time, substantial base weight contributes to benchtop stability when slicing through heavy framing timbers.
The listings present clear DeWalt DWS779 vs DWS780 weight numbers. The DWS779 weighs 67.7 pounds, making it one of the heavier 12-inch sliding miter saws in its class. In contrast, the DWS780 listing emphasizes a compact, lightweight design rated at 58 pounds (also noted as 24.8 kg in specifications). That nearly ten-pound difference is immediately noticeable when navigating narrow staircases, loading a truck bed, or lifting the tool onto a rolling stand. When evaluating the dewalt dws780 vs bosch gcm12sd class of tools, saving nearly ten pounds without sacrificing cutting capacity provides a clear operational advantage.
If your saw remains bolted to a dedicated bench in a home shop, the extra mass of the DWS779 creates a firmly planted workstation that absorbs vibration during heavy timber cuts. But for contractors who move tools from site to site every afternoon, hauling the 58-pound DWS780 reduces strain and simplifies transit.
Edge: DeWalt DWS780 due to its lighter 58-pound chassis that makes transport substantially easier than the 67.7-pound frame of the DWS779.
Cutting Capacity and Molding Support
Crosscut capacity dictates the widest boards a sliding saw can sever in a single stroke, while vertical fence clearance determines whether you can cut tall baseboard and crown molding standing upright. Having substantial vertical and nested support saves time by allowing you to make cuts without laying trim flat on compound bevel angles.
Comparing the structural dimensions in any DeWalt DWS779 review against a DeWalt DWS780 review reveals identical capacity specifications. Both units handle up to 2 x 14 dimensional lumber at 90 degrees and 2 x 10 dimensional lumber at 45 degrees. Both saws incorporate tall sliding fences designed to support crown molding up to 7-1/2 inches nested and base molding up to 6-3/4 inches vertically against the fence. When beveling, these fences slide clear of the blade path to maintain stock support while avoiding clearance issues.
Because the internal geometry and fence castings match across both tools, woodworkers lose nothing in raw capacity by selecting one over the other. Slicing through wide dimensional joists or nested architectural trim yields identical dimensional limits on both models, meaning secondary considerations like lighting determine the purchase.
Edge: Tie because both saws deliver identical crosscut limits, vertical baseboard clearances, and nested crown molding support.
Miter and Bevel Adjustments
Angle flexibility and detent reliability dictate how accurately a saw returns to standard cutting positions like 22.5, 31.6, and 45 degrees. Stamped plates can wear down over time, introducing loose tolerances that ruin tight miter joints. A rigid detent system backed by clear bevel indicators ensures predictable cuts day after day.
When reviewing the DeWalt DWS780 vs DWS779 mechanics, the adjustment mechanisms are virtually identical. Both models feature an adjustable stainless-steel miter detent plate with 10 positive stops. Each saw miters 60 degrees to the right and 50 degrees to the left, offering expanded capacity beyond standard 45-degree frames. Both incorporate a cam lock miter handle with a detent override, which lets you bypass positive stops to dial in fractional angles without the pin snapping into adjacent slots.
Bevel capabilities mirror each other as well. Both the DWS779 and the DWS780 provide dual-bevel travel up to 49 degrees to the left and to the right, supported by an oversized, high-visibility bevel scale. Woodworkers looking at a lighter alternative like the dewalt dws779 vs dws715 will appreciate that these sliding saws offer true double-bevel flexibility, eliminating the need to flip heavy workpieces over to complete mirrored cuts.
Edge: Tie as both models feature identical stainless-steel miter plates, 10 positive stops, cam locks, and 49-degree dual-bevel travel.
Motor Performance and Drive Design
Continuous cutting through wet dimensional stock, engineered lumber, and dense hardwoods demands robust motor torque and stable gearing. If a motor bogs down during crosscuts, blade speed drops, leaving rough tear-out and increasing thermal stress on the motor windings. Stable power delivery ensures clean, repeatable slicing under heavy loads.
Both saws feature an advanced 15 Amp motor producing an unladen blade speed of 3,800 RPM. The DWS780 listing specifies an 1100-watt output with a 1675-watt rating, designed specifically for heavy-duty applications. Both saws employ an innovative gearbox and belt-drive design that shifts mechanical bulk away from the work surface, increasing vertical cutting clearance against the fence. Those researching cordless hybrid alternatives like the dewalt dws780 vs dhs790 will find that corded 120V and 110V power guarantees sustained 15-amp power delivery without runtime limits.
Dual horizontal steel rails with linear ball bearings support the cutting head on both tools, paired with an innovative clamping mechanism for smooth travel and tight tolerances. Because the internal drive belts, bearing systems, and motor ratings are fundamentally equivalent, both tools cut through heavy construction timber and delicate trim with the same underlying strength.
Edge: Tie as both units share a 15 Amp, 3,800 RPM motor paired with an innovative belt-drive gearbox and dual steel rail assembly.
Dust Collection Efficiency
Miter saws produce massive volumes of fine airborne particles and heavy shavings that quickly clutter jobsite floors and indoor workshops. Effective onboard extraction keeps cutting lines visible, reduces cleanup hours, and prevents respiratory irritation during high-volume cutting sessions.
Both models feature a super-efficient dust collection system documented to capture over 75% of dust generated during cutting operations. Each package includes a factory dust collection bag that attaches directly to the rear extraction chute behind the blade. The chute moves along with the sliding head assembly, staying close to the blade kerf to catch debris as it leaves the cut.
Contractors asking is DWS780 worth it for superior dust management should note that the extraction chute design and 75% capture rating are identical across both platforms. When exploring shop upgrades like the dewalt dws779 vs dhs790, dust control performance remains on equal footing. Connecting either saw to a dedicated vacuum or shop extractor via the rear port captures fine sawdust efficiently during indoor trim installations.
Edge: Tie because both tools share the same dust collection chute geometry and 75% collection efficiency rating.
Pros and Cons
DeWalt DWS779
Pros
- Massive 2 x 14 crosscut capacity at 90°
- Powerful 15 Amp 3800 RPM motor
- Dual bevel cuts up to 49° both directions
- Includes 80-tooth carbide blade and clamp
Cons
- Heavy 67.7-pound carrying weight
- Lacks XPS shadow cutline system
DeWalt DWS780
Pros
- Integrated XPS LED shadow line indicator
- Lighter 58-pound transport weight
- Supports 7-1/2 in. nested crown molding
- 10 positive stops with detent override
Cons
- Requires AAA battery for shadow light
- Substantially higher financial investment
Who Should Buy Each One
Choose the DeWalt DWS779 If
- You primarily cut framing lumber, deck boards, and dimensional studs where pencil-line alignment is sufficient.
- Your miter saw will remain stationary on a dedicated shop workbench where a 67.7-pound weight is an asset rather than a burden.
- You want 2 x 14 crosscut capacity and dual-bevel flexibility without paying extra for factory-installed lighting systems.
- You are comfortable sighting the blade teeth directly against the workpiece during precision joinery.
Choose the DeWalt DWS780 If
- You install crown molding, baseboards, and window casings where the XPS shadow cutline system saves layout time on every cut.
- You transport your tools between different jobsites regularly and benefit from a lighter 58-pound carrying profile.
- You frequently swap blades and want an alignment guide that never requires manual laser recalibration.
- You want a complete, professional-grade finish carpentry station ready for high-accuracy production out of the box.
Final Verdict
The primary DeWalt DWS779 vs DWS780 differences do not lie in motor power, cutting reach, or bevel geometry. Both machines feature a 15 Amp, 3,800 RPM motor, dual horizontal steel rails, a 60-degree right and 50-degree left miter range, and identical 2 x 14 crosscut capacities. For general construction, rough carpentry, and stationary woodshops where the tool never leaves the bench, the DWS779 delivers professional-grade capacity and structural durability at maximum core value.
However, the DWS780 earns the top recommendation for finish carpenters, cabinet makers, and mobile contractors. Its integrated XPS LED shadow light system projects an exact kerf silhouette that never drifts out of alignment, while its 58-pound frame trims nearly ten pounds off the DWS779’s 67.7-pound bulk. If daily productivity relies on rapid optical alignment and regular jobsite mobility, the DWS780 is the superior tool for your workshop.
FAQ
Does the DeWalt DWS779 have an XPS cutline light?
No, the DWS779 listing does not include the XPS LED shadow light system. Alignment on the DWS779 is done manually by lining up the blade teeth with your cut mark, whereas the DWS780 includes the XPS system pre-installed from the factory.
What is the weight difference between the DWS779 and DWS780?
The DWS779 is listed at 67.7 pounds, while the DWS780 is listed at 58 pounds (24.8 kg). This gives the DWS780 an advantage of nearly ten pounds, making it easier to lift, carry, and transport between job sites.
Can the DWS779 cut the same width boards as the DWS780?
Yes, both saws share identical cutting capacities. Each model cuts up to 2 x 14 dimensional lumber at 90 degrees and up to 2 x 10 dimensional lumber at 45 degrees, while supporting nested crown molding up to 7-1/2 inches.
Do both saws feature double bevel capability?
Yes, both the DWS779 and DWS780 are dual-bevel sliding compound miter saws. They both bevel from 0 to 49 degrees to the left and right, supported by an oversized scale and positive stops for rapid angle changes.
Why does the DWS780 listing mention a battery?
The DWS780 listing specifications note that 1 AAA battery is required, which provides auxiliary power for operating the integrated XPS LED shadow light system independently.
What accessories are included in the box with each saw?
The DWS779 includes a blade wrench, carbide blade, the miter saw unit, a vertical material clamp, and a dust bag. The DWS780 listing includes the miter saw, blade wrench, material clamp, and dust bag along with an 80-tooth blade.
