DeWalt 12-Inch Miter Saws: DWS779 vs DWS780 Compared
What's inside
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The DeWalt DWS779 is the better buy if you’re comfortable lining up cuts with the blade; the DWS780 costs more for its XPS LED shadow line, which projects the blade’s cut path onto the workpiece without needing laser adjustment. Their core cutting capacity is very similar, so the choice usually comes down to alignment convenience, price, and how you’ll handle dust extraction.
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DWS779 vs. DWS780 at a glance
| Feature | DeWalt DWS779 | DeWalt DWS780 |
|---|---|---|
| Blade diameter | 12 inches | 12 inches |
| Motor | 15 amp, corded | 15 amp, corded |
| Maximum crosscut at 90° | About 2 × 14 inches | About 2 × 14 inches |
| Maximum crosscut at 45° | About 2 × 10 inches | About 2 × 10 inches |
| Crown molding capacity, nested | Up to 7½ inches | Up to 7½ inches |
| Cut-line system | Blade guard and workpiece sighting | XPS LED shadow line |
| Approximate tool weight | 56 lb | 56 lb |
| Dust collection | Dust bag and port; extraction results vary | Dust bag and port; extraction results vary |
Capacities are manufacturer-stated maximums, not a promise that every piece will fit comfortably in every setup. Check the manual for your exact model and configuration, especially if you’re cutting tall molding or using a particular blade. Both saws are sliding compound miter saws, and neither is a compact, easy-to-carry 12-inch option.
The real difference: XPS shadow line
The DWS780’s XPS system uses an LED to cast the blade’s shadow onto the material. The shadow shows the kerf—the width of the cut—so you can place the workpiece against the line and see where the blade will remove material. Unlike a laser line, it does not require positioning or calibration to match the blade.
The DWS779 lacks this system. You can still make accurate cuts by lowering the blade with the saw unplugged to check your layout, or by making a careful test cut on scrap. That takes an extra step, but it works well for a budget-conscious shop or occasional projects. The XPS upgrade is most useful when you make lots of repeated cuts, work with pencil-thin layout marks, or want to check alignment quickly in changing shop conditions.
When the upgrade pays off
Think about the added cost against your cut volume, not just the feature list. If the DWS780’s price premium is modest and you use the saw frequently, faster setup and fewer alignment checks can make it worthwhile. If you cut trim only occasionally, the DWS779’s standard sighting method may be enough. Neither model turns a rough layout into a precise cut: a sharp blade, secure material support, and a consistent measuring routine still matter.
Cut capacity and crown molding: nearly a tie
Both models have a 12-inch blade and sliding rails, with a stated maximum crosscut of roughly 14 inches at 90 degrees and 10 inches at 45 degrees in 2-inch-thick stock. Those figures are useful for checking whether a board or panel fits, but they assume the material is positioned correctly and adequately supported. A wide cut also needs room behind the saw for the sliding mechanism.
For crown molding, both are commonly listed with a nested capacity of up to 7½ inches. That means the molding is placed on the saw table in its installed orientation, with its back against the fence. Actual fit depends on the molding’s profile, spring angle, and how much room the fence and table provide. Test a short offcut before committing to finished material; a nominal capacity does not guarantee that an unusually deep or irregular profile will sit securely.
Both saws also support bevel and miter cuts for compound work. For production trim, make a setup block or mark the fence and table once the angle is dialed in. This reduces repeated measuring and helps reveal whether the molding is shifting between cuts.
Dust collection: plan for a vacuum, not a dust-free shop
Both saws include a dust bag and an extraction port, but sliding miter saws are difficult to contain completely: the blade throws chips in several directions, and a bag alone typically leaves noticeable debris. The DWS780’s XPS light does not improve dust pickup; the collection arrangement is broadly similar between the two models.
If you’re connecting a shop vacuum, verify the port diameter and connector fit on your specific saw. A reducer or adapter may be needed, and a secure connection is better than a loose hose that slips off as the saw slides. For frequent indoor work, position a vacuum pickup close to the rear of the blade and use a support or hood behind the saw if your workspace allows. Expect to clean the rails and surrounding area even with extraction connected.
Keep the sliding mechanism moving freely
- Unplug the saw before cleaning or inspecting it.
- Brush or vacuum sawdust from the rails and around the fence after dusty sessions; packed debris can interfere with smooth travel and workpiece seating.
- Follow the manual’s care guidance rather than applying grease indiscriminately. Lubricant can attract sawdust.
- Inspect the blade for resin buildup, dull teeth, and damage. A dirty or dull blade can worsen cut quality and increase effort.
- Check fence alignment and bevel or miter settings with a reliable square after transport or a hard impact.
Which one should you buy?
| Your situation | Better fit | Why |
|---|---|---|
| Price is the priority; cuts are occasional | DWS779 | Same basic size and major capacity, without paying for XPS. |
| Frequent trim or cabinet work with repeated setups | DWS780 | The shadow line makes cut placement faster to verify. |
| You move the saw often between sites | Neither is an easy-carry pick | Both weigh about 56 lb; consider a wheeled stand or a lighter saw if portability matters most. |
| You need wide crosscuts and have room for the rails | Either | Their stated crosscut capacities are essentially the same. |
For a simple cost-per-use check, divide the DWS780’s price premium by the number of cuts you expect over the saw’s useful life. For example, a hypothetical $100 premium spread across 5,000 cuts is 2 cents per cut. That does not prove the upgrade is worthwhile, but it gives frequent users a way to compare convenience with cost; for a homeowner making a few dozen cuts a year, the same premium may be harder to justify.
Bottom line
Choose the DWS779 if you want a capable corded 12-inch sliding miter saw and are willing to take an extra moment to confirm your cut line. Choose the DWS780 if the XPS shadow line will save time across frequent or repetitive work. Don’t choose between them based on crown capacity or dust collection: those are not meaningful advantages of one over the other. Compare current market prices, confirm the molding and board sizes you actually need to cut, and budget for dust management either way.
