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Product Business use Processor (Max) Memory (Min/Max) Internal storage (Max)
IBM System x3750 M4 Express

Ideal applications include high-performance computing, floating-point applications such as CAE and small to medium databases requiring fast I/O Up to four 8-core Intel Xeon E5-4600 series processors Up to 1.5 TB via 48 slots with 32 GB LR-DIMM Up to 16 TB (2.5" HDD), 6.4 TB (1.8" eXFlash SSD)
IBM System x3630 M4 Express

Ideal applications include backup server, Web 2.0, imagery, video or photo sharing, online gaming, communication and collaboration (including blogs and messaging), file and print, mail server, transactional data, and web searching 2-, 4-, 6-, 8-core Intel Xeon processor E5-2400 product family, up to 1600 MHz memory access speed Up to 192 GB DDR-3 RDIMM memory via 12 DIMM slots 4, 8 x 3.5" simple-swap SATA HDDs or 8 x 3.5" hot- swap SAS/SATA HDDs +tape (value model), 12+2x 3.5" hot-swap (storage-rich model)
IBM System x3530 M4 Express

Ideal applications include file & print, web serving, Web 2.0, virtualization, light database, ERP applications, small HPC install Up to two 8-core Intel Xeon E5-2400 series processors Up to 192 GB via 12 slots UDIMM/RDIMM Up to 8 TB SAS/SATA (2.5" model) or 12 TB SAS/SATA (3.5" model)

IBM System x3500 M4 Express

This high-performance, dual-socket tower server delivers scalability, reliable performance and optimized efficiency for your business-critical applications Up to two Intel® Xeon® Processor E5-2600 product family Maximum 384 GB of DDR3 RDIMMs or 768 GB of DDR3 LRDIMMs or 64 GB of DDR3 UDIMMs, 24 DIMM slots maximum, up to 1600 MHz memory speed Up to 32 2.5" hot-swap and up to 32 TB (HDD upgrade options required) or eight 3.5" hot-swap or simple- swap drives up to 24 TB (via configure to order only)
IBM System x3250 M4 Express

Ideal applications include file and print, retail, network infrastructure and distributed applications Intel Xeon E3-1200v2 Series (quad-core) up to 3.6 GHz/8 MB/1600 MHz, Intel Core i3 2100 series (dual-core) up to 3.4 GHz/3 MB/1333 MHz, Pentium (dual-core) up to 3.0 GHz/3 MB/1333 MHz Standard 1 × 4 GB 1600 MHz DDR-3 UDIMM, maximum 32 GB via four DIMM slots Up to 6.0 TB
IBM System x3100 M4 Express

Ideal applications include file and print, email and collaboration, firewall and small business applications Intel Xeon E3-1200 series (quad-core) up to 3.5 GHz/8 MB/1333 MHz, Intel Core i3 2100 series (dual-core) up to 3.3 GHz/3 MB/1333 MHz, Pentium (dual-core) up to 3.0 GHz/3 MB/1333 MHz and low-cost Celeron 1 × 2 or 1 × 4 GB standard, maximum 32 GB 1333 MHz DDR-3 ECC UDIMMs via 4 DIMM slots 12.0 TB simple-swap Serial ATA hard disk drives
IBM System x3200 M3 Express

Ideal applications include: network infrastructure, file and print, distributed branch office applications, and email and collaboration Intel® Xeon® 3400 Series (quad-core) up to 3.06 GHz or Celeron®, Pentium® or Core i3 (dual-core) up to 3.20 GHz 2x2 GB or 2x1 GB DDR-3 ECC memory standard, up to 1333 MHz; 1 GB, 2 GB and 4 GB UDIMMs; 1 GB, 2 GB, 4 GB and 8 GB RDIMMs 2 x 250 GB 3.5" hot-swap SATA or open bay (model dependent) or up to 8.0 TB SAS or SATA HDDs
IBM System x3250 M3 Express

Ideal applications include: file and print, retail, network infrastructure and distributed applications Intel® Xeon® 3400 Series (quad-core) up to 3.06 GHz or Intel Celeron®, Pentium® or Core i3 (dual-core) up to 3.2 GHz Standard 2x2 GB DDR-3 ECC memory, up to 1333 MHz; 1 GB, 2 GB and 4 GB UDIMMs; 1 GB, 2 GB, 4 GB and 8 GB RDIMMs (No mix of UDIMM and RDIMM) Up to 4.0 TB SATA or 2.4 TB SAS hard disk drives
IBM System x3400 M3 Express

Ideal applications include network infrastructure, file and print, distributed branch office and e-mail and collaboration Intel® Xeon® 5600 (four-core) up to two E5620 2.40 GHz and 1066 MHz memory standard or Intel Xeon 5600 (six-core) up to two X5675 3.06 GHz and 1333 MHz memory (configure to order only) 16 DIMM slots maximum, up to 128 GB with DDR-3 1333 MHz RDIMMs or up to 48 GB with DDR-3 1333 MHz UDIMMs Up to 8.0 TB of 3.5" simple-swap serial ATA (SATA) hard disk drives (HDDs); 16.0 TB of 3.5" hot-swap SATA HDDs or serial attached SCSI (SAS) HDDs; or 16 TB of 2.5" hot-swap SAS or 16 TB of SATA HDDs (model dependent)
IBM System x3500 M3 Express

Ideal uses include your custom business applications, distributed branch applications, file sharing, email and collaboration, web services, departmental database, small-scale virtualization, enterprise resource planning (ERP), and customer relationship management (CRM) Up to two six-core Intel® Xeon® X5690 3.46 GHz processors or four-core Intel Xeon X5687 3.60 GHz with 12 MB of cache per processor socket and up to 6.4 GTps QPI system speed Sixteen DIMM slots maximum, up to 192 GB with DDR-3 1333 MHz RDIMMs or up to 48 GB with DDR-3 1333 MHz UDIMMs Twenty-four 2.5" hot-swap (HDD upgrade options required) or eight 3.5" hot-swap or four 3.5" simple swap (available via configure to order only)
IBM System x3550 M3 Express

Ideal applications include web serving, e-business, collaboration, distributed database, ERP deployments and virtualization Up to two 3.46 GHz six-core (3.60 GHz four-core) Intel® Xeon® 5600 series processors with QuickPath Interconnect technology, up to 1333 MHz memory access speed Up to 192 GB RDIMMs or 48 GB UDIMMs Up to 8.0 TB
IBM System x3620 M3 Express

Ideal applications include file sharing, web services, video and photo sharing, database applications, ERP, and email (e.g., IBM Lotus Notes® and Microsoft® Exchange) Up to two 3.06 GHz 6-core (3.20 GHz 4-core) Intel® Xeon® 5600 series processors with QuickPath Interconnect technology, up to 1333 MHz memory access speed. Also supports select Intel Xeon 5500 series processors Up to 192 GB in 12 slots, using RDIMMs Up to 16 TB Serial Attached SCSI or Serial ATA
IBM System x3630 M3 Express

Ideal applications include: backup server, Web 2.0, imagery, video/photo sharing, online gaming, communication and collaboration (including blogs and messaging), file and print, mail server, transactional data, and web searching Up to two 3.06 GHz 6-core (3.20 GHz 4-core) Intel® Xeon® 5600 series processors with QuickPath Interconnect technology, up to 1333 MHz memory access speed Up to 192 GB DDR-3 RDIMM memory via 12 DIMM slots Up to 14 3.5" or 28 2.5" hot-swap SAS/SATA (up to 28 TB)
IBM System x3650 M3 Express

Ideal applications include Web serving, e-business, collaboration, distributed database, ERP deployments and virtualization Up to two 3.46 GHz six-core (3.60 GHz four-core) Intel® Xeon® 5600 series processors with QuickPath Interconnect technology, up to 1333 MHz memory access speed Up to 192 GB RDIMMs or 48 GB UDIMMs Up to 9.6 TB
IBM System x3755 M3 Express
Ideal applications include: Java™ workloads, HPC, midtier databases, virtualization, and midsized business applications Up to four 2.3 GHz 12-core (2.4 GHz 8-core) AMD Opteron™ 6000 Series processors Up to 512 GB DDR-3 UDIMM/RDIMM memory via 32 DIMM slots Supports up to 8 3.5" hot-swap SAS/SATA HDDs (up to 16 TB)
IBM System x3690 X5 Express
Ideal applications include: Enterprise applications such as ERP or CRM databases and virtualization Eight-core Intel® Xeon® up to 2.27 GHz and 1066 MHz front-side bus, six-core Intel Xeon up to 2.0 GHz and 1066 MHz front-side bus, four-core Intel Xeon up to 1.86 GHz and 1066 MHz memory access 2 GB, 4 GB, 8 GB, 16 GB/up to 512 GB max PC3-10600 DDR III with Advanced Buffer eXecution; 1.0 TB per chassis with MAX5 800 TB SAS per chassis (supports 73.4 GB, 146.8 GB, 300 GB, 500 GB hard disk drives)
IBM System x3850 X5 Express
Ideal applications include: Enterprise applications such as ERP or CRM, small to medium databases and virtualization to support server consolidation Intel Xeon up to 2.4 GHz (10-core)/1066 MHz memory access 32 GB/2.0 TB max PC3-10600 DDR3L, up to 3.0 TB with MAX5 4.8 TB per chassis (supports 8 × 73.4 GB, 146.8 GB, 300 GB, 500 GB and 600 GB SAS hard disk drives, 8 × 160 GB and 500 GB SATA hard disk drives, or 16 × 50 GB and 200 GB solid state drives)

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Business-Class Servers for a PC Budget: IBM System x3100 M4 and x3250 M4.
Learn how IBM’s Xeon E3-based servers are a better choice than desktop PCs as servers.