Garmin Fenix 8 51mm AMOLED vs Tactix 7 AMOLED Edition

Size, specs & wrist fit compared

Garmin Fenix 8 51mm AMOLED Part 010-02905-10

Garmin Tactix 7 AMOLED Edition Part 010-02931-00

Which one fits you

Both need much the same wrist: neither overhangs from 18 cm (7.1 in) round, and both are in their sweet spot around 19 cm and up. Wrist size will not decide between these two.

What else differs

Battery: 31 days for the Tactix 7 AMOLED Edition against 29 days for the Fenix 8 51mm AMOLED in everyday use; about 3.4 days each with GPS on.

The Fenix 8 51mm AMOLED and Tactix 7 AMOLED Edition share a near-identical 51mm case, so on the wrist the difference is thickness and weight.

The Fenix 8 51mm AMOLED is thinner than 98% of the 52 smartwatches 51mm across that we hold thickness for, the Tactix 7 AMOLED Edition is thinner than 87% — so both wear flatter than their widths suggest.

The Fenix 8 51mm AMOLED is 0.2mm thinner and 6g heavier than the Tactix 7 AMOLED Edition.

Fenix 8 51mm AMOLED

Tactix 7 AMOLED Edition

Case width

51mm

51mmsame

Thickness

14.7mm

14.9mm+0.2mm

Weight

102g

96g−6g

Fenix 8 51mm AMOLED or Tactix 7 AMOLED Edition by wrist size

Wrist round (mm left each side)	Fenix 8 51mm AMOLED≈58.5mm lug to lug, est.	Tactix 7 AMOLED Edition≈58.5mm lug to lug, est.
14 cm / 5.5 in	Overhangs (6.7mm over)	Overhangs (6.7mm over)
15 cm / 5.9 in	Overhangs (5.1mm over)	Overhangs (5.1mm over)
16 cm / 6.3 in	Overhangs (3.4mm over)	Overhangs (3.4mm over)
17 cm / 6.7 in	Overhangs (1.8mm over)	Overhangs (1.8mm over)
18 cm / 7.1 in	Overhangs (0.2mm over)	Overhangs (0.2mm over)
19 cm / 7.5 in	Bold (1.4mm)	Bold (1.4mm)
20 cm / 7.9 in	Sweet spot (3mm)	Sweet spot (3mm)

How the fit model works · Size chart for every wrist

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Garmin

Fenix 8 51mm AMOLED

Garmin

Tactix 7 AMOLED Edition

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Battery life compared

Furthest apart in All systems + multi-band mode, where the Fenix 8 51mm AMOLED lasts 1.6× as long as the Tactix 7 AMOLED Edition (2.6 days against 38 hours).

Fenix 8 51mm AMOLEDTactix 7 AMOLED Edition

Battery saver
41 days
41 days
Expedition
31 days
27 days
Smartwatch
29 days
31 days
Max battery GPS
145 hours
145 hours
GPS only
84 hours
82 hours
All systems
68 hours
62 hours
All systems + multi-band
62 hours
38 hours
All systems with music
18 hours
17 hours

More comparisons

Garmin Descent G2 vs Garmin Fenix 8 51mm AMOLED Garmin Fenix 8 51mm AMOLED vs Garmin Venu 4 45mm Garmin Approach S50 vs Garmin Fenix 8 51mm AMOLED Garmin Tactix 7 AMOLED Edition vs Garmin Tactix 8 51mm AMOLED

2D Dimension Schematics

Top view

Side view

Garmin Fenix 8 51mm AMOLED 51mm × ≈58.5mm (est.) · 14.7mm thick
Garmin Tactix 7 AMOLED Edition 51mm × ≈58.5mm (est.) · 14.9mm thick

Full specs: Garmin Fenix 8 51mm AMOLED Full specs: Garmin Tactix 7 AMOLED Edition

3D preview

Fenix 8 51mm AMOLED vs Tactix 7 AMOLED Edition on a wrist

Open 3D try-on

Specifications

The short version

7 key specs

Spec	GarminFenix 8 51mm AMOLED	GarminTactix 7 AMOLED Edition
Case Width	51mm	51mm
Thickness	14.7mm	14.9mm
Weight	102g	96g
Shape	Circular	Circular
Display type	AMOLED	AMOLED
Battery life	Smartwatch: Up to 29 days (13 days always-on) Battery Saver Watch Mode: Up to 41 days GPS Only: Up to 84 hours (65 hours always-on) All Satellite Systems: Up to 68 hours (54 hours always-on) All Satellite Systems + Multi-band: Up to 62 hours (49 hours always-on)* All Satellite Systems + Music: Up to 18 hours Max Battery GPS: Up to 145 hours Expedition GPS: Up to 31 days *Assuming typical use with SatIQ technology	Smartwatch: Up to 31 days (11 days always-on) Battery Saver Watch Mode: Up to 41 days GPS Only: Up to 82 hours (58 hours always-on) All Satellite Systems: Up to 62 hours (48 hours always-on) All Satellite Systems + Multi-band: Up to 38 hours (30 hours always-on) All Satellite Systems + Music: Up to 17 hours Max Battery GPS: Up to 145 hours Expedition GPS: Up to 27 days
Released	2024	2023

Where the specifications differ

21 differences

Spec	Garmin Fenix 8 51mm AMOLED	Garmin Tactix 7 AMOLED Edition
General
Battery life	Smartwatch: Up to 29 days (13 days always-on) Battery Saver Watch Mode: Up to 41 days GPS Only: Up to 84 hours (65 hours always-on) All Satellite Systems: Up to 68 hours (54 hours always-on) All Satellite Systems + Multi-band: Up to 62 hours (49 hours always-on)* All Satellite Systems + Music: Up to 18 hours Max Battery GPS: Up to 145 hours Expedition GPS: Up to 31 days *Assuming typical use with SatIQ technology	Smartwatch: Up to 31 days (11 days always-on) Battery Saver Watch Mode: Up to 41 days GPS Only: Up to 82 hours (58 hours always-on) All Satellite Systems: Up to 62 hours (48 hours always-on) All Satellite Systems + Multi-band: Up to 38 hours (30 hours always-on) All Satellite Systems + Music: Up to 17 hours Max Battery GPS: Up to 145 hours Expedition GPS: Up to 27 days
Case material	fiber-reinforced polymer with metal rear cover	fiber-reinforced polymer with titanium rear cover
Lens Material	Corning® Gorilla® Glass or sapphire crystal	sapphire crystal
Bezel Material	stainless steel or titanium	titanium
Strap material	silicone	nylon and silicone
Product Info
Main SKU	010-02905-10	010-02931-00
Product ID	1228171	1297277
Product Name	fēnix® 8 – 51 mm, AMOLED	tactix® 7 – AMOLED Edition
Product Variation	Sapphire, Titanium with Spark Orange/Graphite Silicone Band	Premium Tactical GPS Watch with Adaptive Color Display
Running Features
Ground contact time and balance	yes (GCT balance with accessory)	Yes
What You'll Love
LED flashlight	Yes	yes (white/green)
Battery life (smartwatch mode)	Up to 29 days (13 days always-on)	Up to 31 days (11 days always-on)
Activity Profiles
Wellness	Walking, Indoor Walking, Pilates, Yoga	Walking, Pilates, Yoga, Indoor Walking
On the Water	Stand Up Paddleboarding, Rowing, Kayaking, Surfing, Kiteboarding, Windsurfing, Fishing, Boating, Sailing, Water Skiing, Wakeboarding, Wakesurfing, Tubing, Snorkeling, Whitewater	Stand Up Paddleboarding, Rowing, Kayaking, Surfing, Kiteboarding, Windsurfing, Fishing, Boating, Sailing, Sail Racing, Water Skiing, Wakeboarding, Wakesurfing, Tubing, Snorkeling, Sailing Expedition, Whitewater
Outdoor recreation	Hiking, Rucking, Indoor Climbing, Bouldering, Climbing, Hunting, Horseback Riding, Golfing, Disc Golf, Archery	Hiking, Indoor Climbing, Bouldering, Climbing, Hunting, Horseback Riding, Golfing, Disc Golf, Archery
Other activity profiles	Inline Skating	Jumpmaster, Tactical, Inline Skating
Outdoor Recreation
Tides	Yes	yes (via Connect IQ™)
Fish forecast	Yes	yes (via Connect IQ™)
Preloaded road and trail maps	yes (Sapphire Editions only)	Yes
Daily Smart Features
Connectivity	Bluetooth®, ANT+®, Wi-Fi®	BLUETOOTH®, ANT+®, Wi-Fi®
Health & Wellness Monitoring
Fitness age	Yes	yes (in app)

The other 270 specifications both list are identical.

Full Garmin Fenix 8 51mm AMOLED specifications →Full Garmin Tactix 7 AMOLED Edition specifications →

Fenix 8 51mm AMOLED specs →Tactix 7 AMOLED Edition specs →Compare more watches →