Which saw is better for cutting wet pressure-treated lumber?

The DCS578B. Its 60V motor puts out 2,456 unit watts out, and DeWalt claims up to 47% more power than the older DCS575. The DCS590B's 1,700 max watts out will bog down more in wet, thick stock.

Is the 60V saw worth about $18 more?

Only if you already own FlexVolt batteries. At $184.99 at Walmart versus $167.00 at eBay as of November 4, 2026, the gap is small, but a 60V 9.0Ah battery and charger cost far more than the saw itself if you are starting fresh.

Which one lasts longer on a charge?

The DCS590B publishes up to 368 cuts per charge on 20V MAX XR batteries. DeWalt does not publish a cuts-per-charge figure for the DCS578B, so compare run time on the same battery class before deciding.

Do both saws cut the same depth?

Yes. Both cut 2-9/16 in. at 90° and both bevel to 57° with stops at 22.5° and 45°. The difference is power and weight, not capacity.

Which is easier to carry around a job site?

The DCS578B at 8.2 lbs net tool weight, versus 9.85 lbs for the DCS590B. Both have a right-side blade and top handle, and the 60V saw adds a rafter hook.

Can I use my existing 20V batteries in the 60V saw?

Yes. FlexVolt batteries run at 20V in 20V tools and at 60V in the DCS578B, so one pack set covers both platforms. The DCS590B takes only 20V MAX batteries.

DeWalt DCS578B 60V Max 7-1/4" Circ Saw Bare vs DEWALT 20V MAX XR Brushless Cordless 7-1/4 in. Circular Saw, Tool Only (DCS590B)

Buy the DCS578B if you already own DeWalt FlexVolt 60V batteries or cut thick, wet or pressure-treated lumber all day; its 2,456 unit watts out and 60V power rival a corded saw. Buy the DCS590B if you are on the 20V MAX platform and want a lighter, cheaper saw for framing and trim. The DCS578B is $184.99 at Walmart as of November 4, 2026, and the DCS590B is $167.00 at eBay as of the same date, so the 20V saw costs about $18 less.

Today the DEWALT 20V MAX XR Brushless Cordless 7-1/4 in. Circular Saw, Tool Only (DCS590B) costs $17.99 less at its best price.

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