SIDE-BY-SIDE HARDWARE AUDITZero Pricing • Objective Specification Advantage Highlighting
Lenovo ThinkPad T420 (Classic 7-Row Keyboard) vs Lenovo ThinkPad T400 (Roll Cage Legend)
Compare processor microarchitectures, maximum GPU TGP, display color accuracy, RAM upgradability, and battery Watt-hours with automated win badge analysis.
Slot 1 • Lenovo2011
Lenovo ThinkPad T420 (Classic 7-Row Keyboard)
14" TFT LCD • 2.24 kg • x86_64
Slot 2 • Lenovo2008
Lenovo ThinkPad T400 (Roll Cage Legend)
14.1" TFT LCD • 2.13 kg • x86_64
Reasons to Choose Lenovo ThinkPad T420 (Classic 7-Row Keyboard)
- ✓Larger Battery Capacity (94Wh vs 84Wh)
- ✓Higher Max GPU TGP (15W vs 12W)
Reasons to Choose Lenovo ThinkPad T400 (Roll Cage Legend)
- ✓Lighter Chassis (2.13 kg vs 2.24 kg)
- ✓Thinner Profile (27.6 mm vs 30.5 mm)
- ✓Higher Peak Brightness (250nits vs 220nits)
01.Platform & Compute Subsystem
Processor architecture, graphics envelope, and power ceilingProcessor / SoC
Intel Core i5-2520M / Core i7-2640M (Sandy Bridge 32nm)
Intel Core 2 Duo P8400 / P8600 / T9400 (Penryn 45nm, 3MB/6MB L2)
CPU Core Architecture
2-core / 4-thread (2.5 GHz base, 3.2 GHz Turbo Boost)
2-core / 2-thread (2.26 GHz up to 2.53 GHz)
ISA Architecture
x86_64
x86_64
Graphics Hardware
NVIDIA NVS 4200M (1GB Optimus) / Intel HD Graphics 3000
Switchable Graphics: ATI Mobility Radeon HD 3470 (256MB) / Intel GMA 4500MHD
Maximum Graphics TGP
15 W+3 W
12 W
Operating System
Windows 7 Professional
Windows XP Professional / Windows Vista Business
02.Memory & Storage Upgradability
RAM capacity, SODIMM vs soldered, and NVMe expansionRAM Capacity Options
4 GB / 8 GB / 16 GB DDR3
2 GB / 4 GB / 8 GB DDR3
RAM Technology / Speed
DDR3-1333 MHz SODIMM
DDR3-1066 MHz SODIMM
RAM Upgradability
✅ User-Upgradable
✅ User-Upgradable
RAM Sockets / Form Factor
2x SO-DIMM (Upgradable to 16 GB)
2x SO-DIMM (Upgradable to 8 GB)
M.2 SSD Expansion Slots
1 Slot
1 Slot
Storage Bus & Architecture
2.5-inch SATA III bay + internal mSATA slot in WWAN slot
2.5-inch SATA II (3.0 Gbps) drive bay + Ultrabay Slim hot-swappable secondary drive
03.Display & Color Accuracy
Panel technology, screen resolution, refresh rate, and luminancePanel Technology
TFT LCD
TFT LCD
Screen Diagonal Size
14 inches
14.1 inches
Aspect Ratio
16:9
16:10
Resolution
1600 × 900 px (HD+ Anti-glare)
1440 × 900 px (WXGA+ LED backlit display)
Display Refresh Rate
60 Hz
60 Hz
Color Gamut Coverage
65% sRGB
60% sRGB
Peak Brightness
220 nits
250 nits+30 nits
04.Chassis, Thermals & Battery
Enclosure weight, profile thickness, battery capacity, and chargingChassis Weight
2.24 kg
2.13 kg-0.11 kg lighter
Chassis Thickness
30.5 mm
27.6 mm-2.9 mm lighter
Chassis Materials
Magnesium Roll Cage base with titanium composite top cover, classic 7-row tactile keyboard
Magnesium-alloy internal Roll Cage structure with carbon-fiber reinforced plastic lid
Cooling Solution
Enhanced Owl-wing fin fan with copper heatpipe module
Copper heatsink with single high-durability quiet fan and intake vents
Battery Capacity
94 Wh+10 Wh
84 Wh
Bundled Charger Wattage
90 W
90 W
USB-C Power Delivery
No
No
05.I/O Ports & Connectivity
High-speed buses, external display outs, and media card readersPort Complement
4x USB 2.0 (one Powered USB, one eSATA/USB combo), DisplayPort, VGA, Gigabit Ethernet, ExpressCard/34, 4-in-1 SD reader, Ultrabay, ThinkLight
3x USB 2.0, VGA D-Sub video port, Gigabit Ethernet RJ-45, Modem RJ-11, IEEE 1394 FireWire 400, ExpressCard/54, 3.5mm mic in & headphone out, ThinkLight keyboard LED
Thunderbolt Ports
None
None
HDMI Revision
DisplayPort 1.1a (Supports full HDMI/DVI audio via adapter)
None (VGA & DisplayPort via optional Advanced Mini Dock)
Card Reader
Full-size SDXC Reader
None Reader
3.5mm Headphone Jack
✅ Present
✅ Present
Wireless Networking
Intel Centrino Advanced-N 6205 802.11a/b/g/n, Bluetooth 3.0
Intel WiFi Link 5100/5300 802.11a/g/n, Bluetooth 2.1, Optional WWAN 3G