Device & Networks Transfer Rates DeviceSpeed Mbytes/sec Fibre Channel2,000 SATA [1.0] Disk Drive1,500 SATA [3.0] Disk Drive3,000 FireWire 800800 USB 2.0640 WIFI (802.11g)54 Internal Network100 or 1,000 Internet connection2 - 10 NBN100 – 1,000
Processor Speed Limits Practical limit of ~3Ghz clock speed reached in 2003 Manufacturers turned to hyperthreading & multicore architectures Multicore is running two or more actual CPUs on one chip Concurrency is the next major revolution in how software will be written. HOWEVER - CAD is not concurrent - yet
Computer Specifications - Considerations Moores Law – computing power doubles every 2 years What Andy giveth, and Bill taketh away CAD is single treaded – only uses one processor core RAM – rule of thumb – RAM usage will be file size x10 Operating System XP – 32bit has 3Gb memory limit W7 - 64 bit has 16Eb memory limit
Workstations - How much memory? RAM – rule of thumb – RAM usage will be file size x10 Test - 150Mb Revit file 150Mb file expanded to 1.6Gb RAM 8Gb will do 12Gb to be future proof Workstation memory usage, OS + Revit 2.65Gb Workstation memory usage, OS + Revit + 150Mb project File 4.22Gb
Workstations - How fast? CAD is single threaded HP Workstation – Intel Xeon CPU 3.2Ghz – 4 core processors Revit running flat out to export a file Only 50% of one processor active
Workstations - How fast? CAD is single threaded HP Workstation – Intel Xeon CPU 3.2Ghz – 4 core processors Revit running flat out to render an image ALL processors active
Computer Specifications Specification Processors Intel i7 > 2.3 GHz RAM 12Gb (8Gb will suffice) Graphics Cards 1Gb RAM on AutoCAD Approved list Operating System Windows 7 64 bit Disk capacity 200Gb+ Disk Type SSD or SATA 2 or 3 Network cards 1Gb/s Screen 1 x 27 + 1 x 19 Budget $3k - $4k
Construction Sequencing – 4D Federated model software – e.g. Navisworks or Navigator Name, identify and classify components and systems correctly Indentifying components with a phasing parameter assists Model for construction – e.g. Draw a slab as it will be poured Interfaces to project management software, or Spreadsheet, or Can contain the sequence in the federated model file
Cost Estimating – 5D Generally done by interface to the source 3D files, not federated model e.g. CostX uses a DWF export Name, identify and classify components and systems correctly Degree of accuracy needs to be consistent across project Assists if the QS parameters are applied to equipment: Australian Cost Management Manual – Guidelines for Cost Planning Consulting Services Can be fiddly to get the export correct – test your files with the target software – CostX have a free viewer
Animations Federated model software – e.g. Navisworks or Navigator Done using similar techniques as 4D construction sequencing Name, identify and classify components and systems correctly Can be done on a good quality workstation
Simple to do in 3D modelling software Helpful if correct materials and colours applied to systems Not photorealistic Can be done on a good quality workstation
Photorealistic – Physical Based Rendering Fluorescent Downlight LED Downlight
Photorealistic – Physical Based Rendering Basis is a well constructed 3D model Materials need to be correctly applied Name, identify and classify components and systems correctly Single image will tie up a workstation – e.g. 22 hours Needs high end render farms
Software Upgrades Beware the software upgrade Annual releases Often cliff upgrades Need to upgrade across the project team You may been multiple versions to handle different projects Average large project will need 3-5 software upgrades of all project files.
In Summary Fast workstations Fast network Central storage Good backup Fast internet connection – cannot be too fast Be aware of the impact of software versions
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