SAMSUNG C34J791 vs ASUS ROG Strix OLED XG27UCDMG Monitor Comparison

SAMSUNG C34J791 and ASUS ROG Strix OLED XG27UCDMG are both monitors with the same Viewing Angle (178° H x 178° V) and DisplayPort (1). The main differences are in Screen Size, Resolution, Pixel Density and Dot Pitch.

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SAMSUNG C34J791	ASUS ROG Strix OLED XG27UCDMG
Prices (Change region) Out of Stock Free shipping $409.99 Out of Stock Free shipping $474.91 Out of Stock Free shipping $699.99 Out of Stock Free shipping $699.99 Out of Stock $699.99 Out of Stock + $50.00 Shipping $799.99 - Buy now Show 4 more offers	Prices (Change region) In Stock $799.00 Last updated 7 minutes ago. In Stock Free shipping $799.00 In Stock $849.99 In Stock $979.00 In Stock Free shipping $984.99 Show 2 more offers
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Brand SAMSUNG	Brand ASUS
Model LC34J791WTNXZA	Model 90LM0B20-B01971 XG27UCDMG ROG Strix OLED XG27UCDMG 90LM0B20-B019B1
Release Date 📅 January 2019	Release Date 📅 August 2025
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews Add a product review
Price history View Details ►	Price history View Details ►
Screen Size 34"	Screen Size 26.5"
Resolution 3440 x 1440	Resolution 3840 x 2160
Pixel Density 109.68 PPI	Pixel Density 166.26 PPI
Dot Pitch 0.23 mm	Dot Pitch 0.15 mm
Panel Type VA	Panel Type QD-OLED
Widescreen Yes	Widescreen Yes
Aspect Ratio 21:9	Aspect Ratio 16:9
Curved Screen Yes	Curved Screen No
Viewing Angle 178° H x 178° V	Viewing Angle 178° H x 178° V
Brightness 300 cd/m²	Brightness 1000 cd/m²
Contrast Ratio 3000:1	Contrast Ratio -
Response Time 4 ms	Response Time 0.03 ms
Refresh Rate 100 Hz	Refresh Rate 240 Hz
Built-in Speakers Yes	Built-in Speakers No
DVI 0	DVI 0
DisplayPort 1	DisplayPort 1
HDMI 1	HDMI 2
VGA 0	VGA 0
G-SYNC Support No	G-SYNC Support Yes
FreeSync Support Yes	FreeSync Support Yes
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