Safari 4 for Mac - Technical Specifications
Macintosh Requirements
- Any Mac running Mac OS X Leopard 10.5.7 or Mac OS X Tiger 10.4.11 and Security Update 2009-002 
- Mac with an Intel processor or a Power PC G5, G4, or G3 processor and built-in FireWire® 
- 256MB of RAM 
- Top Sites and Cover Flow on Mac OS X Tiger require a Quartz-Extreme compatible video card. More details 
What's new in Safari 4
- Top Sites 
- Cover Flow 
- Full History Search 
- Nitro Engine 
- Developer Tools 
- Full-Page Zoom 
- Smart Address Field 
- Smart Search Field 
- Phishing and Malware Protection