DELL EMC R640 vs R740

DELL EMC R640 vs R740

model	R640	R740
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processors	Two Intel® Xeon® Scalable processors, up to 28 cores per processor	Two Intel® Xeon® Scalable processors up to 28 cores per processor
form factor	1U rack	2U rack
memory	24 DDR4 DIMM slots, Supports RDIMM/LRDIMM speeds up to 2666MT/s, 3TB max Up to 12 NVDIMM, 192 GB Max Supports registered ECC DDR4 DIMMs only	24 DDR4 DIMM slots, Supports RDIMM/LRDIMM speeds up to 2666MT/s, 3TB max Up to 12 NVDIMM, 192 GB Max Supports registered ECC DDR4 DIMMs only
drive bays/storage	Front drive bays 10 x 2.5” SAS/SATA with up to 8 NVMe SSD - 58TB or up to 10 NVMe drives - 64TB 4 x 3.5” SAS/SATA HDD - 48TB Rear drive bays: 2 x 2.5” - SAS/SATA, NVMe SSD - 12TB	16 x 2.5” - SAS/SATA - 61TB 8 x 3.5” - SAS/SATA - 96TB
storage controllers	Internal controllers: PERC H330, H730p, H740p, Software RAID (SWRAID) S140 Boot Optimized Storage Subsystem: HWRAID 2 x M.2 SSDs 120GB, 240 GB External PERC (RAID): H840 12Gbps SAS HBAs (non-RAID): External- 12Gbps SAS HBA (non-RAID), Internal- **HBA330 (non-RAID)	Internal controllers: PERC H330, H730p, H740p, Software RAID (SWRAID) S140 Boot Optimized Storage Subsystem: HWRAID 2 x M.2 SSDs 120GB, 240 GB External PERC (RAID): H840 12Gbps SAS HBAs (non-RAID):** External- 12 Gbps SAS HBA (non-RAID), Internal- HBA330 (non-RAID)
I/O slots	Network daughter card options 4 x 1GE or 2 x 10GE + 2 x 1GE or 4 x 10GE or 2 x 25GE Front ports: Video, 1 x USB 2.0, available USB 3.0, dedicated IDRAC Direct USB Rear ports: Video, serial, 2 x USB 3.0, dedicated iDRAC network port Video card: VGA, NVIDIA NVS310 available as PCIe card Up to 3 x Gen3 slots, all x16	Network daughter card options 4 x 1GE or 2 x 10GE + 2 x 1GE or 4 x 10GE or 2 x 25GE Front ports: Video, 2 x USB 2.0, available USB 3.0, dedicated IDRAC Direct Micro-USB Rear ports: Video, serial, 2 x USB 3.0, dedicated iDRAC network port Video card: VGA Riser options with up to 8 PCIe Gen 3 slots, maximum of 4 x 16 slots

reference
Dell PowerEdge R640 vs R740