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Product comparison · 2 laptops

Dell 15 (l521x) vs Dell 15R (1521)

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  • 144specifications compared
  • 52differ
  • 92identical
  • 37known for one product only

Key differences

  • Product colour
    • Aluminium, Silver
    • Black, Silver
  • Display resolution
    • 1920 x 1080 pixels
    • 1366 x 768 pixels
  • Touchscreen
    • No
    • Yes
  • Processor family
    • Intel® Core™ i5
    • Intel® Core™ i7
  • Processor generation
    • 3rd gen Intel® Core™ i5
    • 4th gen Intel® Core™ i7
  • Processor model
    • i5-3230M
    • i7-4500U
  • Processor boost frequency
    • 3.2 GHz
    • 3 GHz
  • Processor frequency
    • 2.6 GHz
    • 1.8 GHz

Side by side

Differences highlightedShow differences only
181 specifications
A

Dell

15 (l521x)View product
B

Dell

15R (1521)View product
Design1 differ
Product colourDiffersAluminium, SilverBlack, Silver
Display2 differ
Display resolutionDiffers1920 x 1080 pixels1366 x 768 pixels
TouchscreenDiffersNoYes
HD typeKnown for oneFull HD
Display brightnessKnown for one250 cd/m²
Processor16 differ
Processor familyDiffersIntel® Core™ i5Intel® Core™ i7
Processor generationDiffers3rd gen Intel® Core™ i54th gen Intel® Core™ i7
Processor modelDiffersi5-3230Mi7-4500U
Processor boost frequencyDiffers3.2 GHz3 GHz
Processor frequencyDiffers2.6 GHz1.8 GHz
Processor cacheDiffers3 MB4 MB
Processor socketDiffersBGA 1023BGA 1168
Processor seriesDiffersIntel Core i5-3200 Mobile seriesIntel Core i7-4500 Mobile series
Processor codenameDiffersIvy BridgeHaswell
Bus typeDiffersDMIDMI2
SteppingDiffersL1C0
Thermal Design Power (TDP)Differs35 W15 W
TjunctionDiffers105 °C100 °C
Maximum number of PCI Express lanesDiffers1612
PCI Express configurationsDiffers1x16, 2x8, 1x8+2x42x4
PCI Express slots versionDiffers3.02.0
System bus rateKnown for one5 GT/s
CPU multiplier (bus/core ratio)Known for one26
Memory3 differ
Internal memoryDiffers4 GB8 GB
Memory layout (slots x size)Differs1 x 4 GB2 x 4 GB
Maximum internal memoryDiffers16 GB8 GB
Storage4 differ
Total storage capacityDiffers532 GB1 TB
Storage mediaDiffersHDD+SSDHDD
HDD capacityDiffers500 GB1 TB
HDD speedDiffers7200 RPM5400 RPM
HDD sizeKnown for one2.5"
Compatible memory cardsKnown for oneMemory Stick (MS), MMC, MMC+, MS PRO, MSXC, SD, SDHC, SDXC
Number of SSDs installedKnown for one1
SSD capacityKnown for one32 GB
SSD interfaceKnown for onemSATA
Graphics3 differ
On-board graphics card modelDiffersIntel® HD Graphics 4000Intel® HD Graphics 4400
Maximum on-board graphics card memoryKnown for one1.74 GB
On-board graphics card base frequencyDiffers650 MHz200 MHz
On-board graphics card DirectX versionKnown for one12
On-board graphics card IDDiffers0x1660xA16
Discrete graphics cardKnown for oneYes
Discrete graphics card modelKnown for oneNVIDIA® GeForce® GT 630M
Discrete graphics memory typeKnown for oneGDDR5
Audio1 differ
Audio systemDiffersHD + Waves MaxxAudio 4MaxxAudio 4
Speaker powerKnown for one2 W
Camera1 differ
Front camera resolution (numeric)Differs1.3 MP1 MP
Front camera resolutionKnown for one1280 x 720 pixels
Network1 differ
Wi-Fi standardsDiffers802.11a, 802.11b, 802.11g802.11b, 802.11g, Wi-Fi 4 (802.11n)
Data networkKnown for oneNot supported
4G WiMAXKnown for oneNo
Integrated 4G WiMAXKnown for oneYes
Ports & interfaces2 differ
USB 2.0 ports quantityDiffers02
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantityDiffers32
HDMI versionKnown for one1.4a
Total number of SATA connectorsKnown for one4
Number of SATA III connectorsKnown for one4
Mini DisplayPorts quantityKnown for one1
Performance1 differ
Motherboard chipsetDiffersIntel HM77 ExpressIntel HM76 Express
Keyboard2 differ
Numeric keypadDiffersNoYes
Keyboard layoutDiffersAZERTYQWERTZ
Spill-resistant keyboardKnown for oneYes
Full-size keyboardKnown for oneYes
Software1 differ
Operating system installedDiffersWindows 8 ProWindows 8
Processor special features9 differ
Intel Dual Display Capable TechnologyDiffersYesNo
Intel Fast Memory AccessDiffersYesNo
Intel Flex Memory AccessDiffersYesNo
Intel ME Firmware VersionKnown for one9.5
Intel Rapid Storage TechnologyDiffersNoYes
Intel Smart Connect TechnologyDiffersNoYes
Intel Smart Connect Technology versionKnown for one1.00
Intel TSX-NIKnown for oneNo
Intel TSX-NI versionKnown for one0.00
Intel® High Definition Audio (Intel® HD Audio)Known for oneYes
Intel® Matrix Storage Technology (Intel® MST)Known for oneYes
Processor ARK IDDiffers7205675460
Processor codeDiffersSR0WXSR16Z
Processor package sizeDiffers31 x 24 (BGA1023)40 x 24 x 1.5 mm
Supported instruction setsDiffersAVXAVX 2.0, SSE4.1, SSE4.2
Graphics & IMC lithographyKnown for one22 nm
Intel® Smart CacheKnown for oneYes
Battery1 differ
Battery technologyDiffersLithium Polymer (LiPo)Lithium-Ion (Li-Ion)
Number of battery cellsKnown for one6
Battery capacityKnown for one65 Wh
Sustainabilityidentical
Sustainability certificatesKnown for oneENERGY STAR
Weight & dimensions4 differ
WeightDiffers2.6 kg2.32 kg
WidthDiffers371 mm376 mm
DepthDiffers249 mm259 mm
HeightDiffers23.2 mm24.9 mm
Other featuresidentical
64-bit computingKnown for oneYes

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