Where is expansion slot utility

These features allows for greater throughput and customization than previous PCI technologies, but does come with the drawback that some cards may not get the number of slots they demand. For instance, if you have two graphics cards in the first and second slots, you can either run both slots at x8 speeds or run one at x1 speeds and one at x16 speeds. This means that if you have two x16 cards in your system, you will need to compromise the performance of one card in order to run the other at its optimal speed for systems before the models.

It also means that you may need to reorganize your cards to get an optimal number of lanes assigned to the card. In early Mac Pros, the system will automatically evenly distribute the number of available lanes to expansion cards.

In the case of the first two slots capable of x16 speeds , if you install two graphics cards then both will run at x8 speeds; however, you can use Apple's Expansion Slot Utility to assign the number of lanes used by each PCI-express slot.

By default, your Mac Pro uses Automatic Bandwidth Configuration to automatically manage how the cards are allocated to each of the two pools. If you want to manually assign the pool allocations for your cards, turn off Automatic Bandwith Configuration and choose a pool for each card. For example, you might want to give a single card percent allocation of pool A. Whenever you make changes to pool allocation, Expansion Slot Utility prompts you to save your changes and restart your Mac before they take effect.

If your PCIe cards can be installed in different slots to provide better performance, you'll see a PCIe card misconfigured notification after your Mac Pro starts up:.

Then, click Expansion Slot Utility to view recommendations on how you should reconfigure your cards. If your Mac Pro doesn't start up and the status indicator light flashes amber twice after installing a PCIe card, the card might not be compatible with your Mac Pro or you might have too many bit PCIe cards installed. If you recently installed one or multiple PCIe cards, remove each card one at a time and try turning on your Mac Pro after each card removal.

Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement. Apple assumes no responsibility with regard to the selection, performance, or use of third-party websites or products. Apple makes no representations regarding third-party website accuracy or reliability. Contact the vendor for additional information. Slot 1: up to x16 lanes double-wide Slot 2: up to x8 lanes double-wide Slot 3: up to x16 lanes double-wide Slot 4: up to x16 lanes double-wide.

Slot 5: up to x16 lanes single-wide Slot 6: up to x8 lanes single-wide Slot 7: up to x8 lanes single-wide Slot 8: up to x4 lanes half-length. Slot 8 is x4 in size. Remove the housing or top cover Follow the steps to remove the housing on Mac Pro or the top cover on Mac Pro Rack, Mac Pro Shut down your Mac Pro. Wait approximately minutes for the computer to cool down.

Unplug all cables except the power cord from your computer. Reply I have this question too 6 I have this question too Me too 6 Me too. View answer in context. Helpful answers Drop Down menu. Feb 12, PM in response to misterdave In response to misterdave Under Tiger, it should launch IF it sees a card added that is not running at proper speed.

Under Leopard, on era, it doesn't launch, even when it should. Sounds like the Tango though has a problem of its own. Loading page content. Reply Helpful Thread reply - more options Link to this Post. Reply Helpful 1 Thread reply - more options Link to this Post. User profile for user: Marc Monaro Marc Monaro. User profile for user: Malcolm Rayfield Malcolm Rayfield.