Photoshop Lightroom 5 / Tech specs
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Intel® Pentium® 4 or AMD Athlon® 64 processor*
DirectX 10–capable or later graphics card
Windows 7 with Service Pack 1, Windows 8, or Windows 8.1
2GB of RAM (4GB recommended)
2GB of available hard-disk space
1024x768 display
DVD-ROM drive required if purchasing Adobe® Photoshop® Lightroom® retail boxed version
Internet connection required for Internet-based services†
Max out on RAM
Photoshop uses random access memory (RAM) to process images. If Photoshop has insufficient memory, it uses hard-disk space, also known as a scratch disk, to process information. Accessing information in memory is faster than accessing information on a hard disk. Therefore, Photoshop is fastest when it can process all or most image information in RAM. If possible, allocate enough RAM to Photoshop to accommodate your largest image file.
How much RAM can Photoshop access?
Photoshop version OS version Maximum amount of RAM that Photoshop can use
CS4, CS5 and later, 32 bit Windows 32 bit 1.7 GB
CS4, CS5 and later, 32 bit Windows 64 bit 3.2 GB