To really step up you'll have to do a lot more than you expected as this is a nice machine to start with.
What I'd suggest is find a forum on the Maxvrayps software and see if folk have tips about settings that help. But to say get the render to happen in half the time you are looking a major changes.
My PC struggles a bit when rendering large scenes using Max/Vray/PS. The following is my actual hardware configuration. Which component could I change without spending too much money but which will noticeably improve the rendering speed?Computer Type = ACPI x64-based PCOperating System= Microsoft Windows 7 Ultimate 6.1.7601 (Win7 RTM)Motherboard:CPU Type QuadCore Intel Core i5-750, 2000 MHz (15 x 133)Motherboard Name Asus P7P55D LE (3 PCI, 2 PCI-E x1, 2 PCI-E x16, 4 DDR3 DIMM, Audio, Gigabit LAN)Motherboard Chipset Intel Ibex Peak P55, Intel LynnfieldSystem Memory 8183 MB (DDR3-1333 DDR3 SDRAM)BIOS Type AMI (09/24/09)Display:Video Adapter ATI Radeon HD 5700 Series (1024 MB)Video Adapter ATI Radeon HD 5700 Series (1024 MB)Video Adapter ATI Radeon HD 5700 Series (1024 MB)3D Accelerator ATI Radeon HD 5750 (Juniper)Your advice will be greatly appreciated.Thanks