When it comes to motherboard form factors, one size does not suit all. For example, there is an ATX form factor (with motherboard dimensions of 12″×9.6″, 30.5 cm×24.4 cm) and a micro-ATX form factor (with motherboard dimensions of 9.6″×9.6″, 24.4 cm×24.4 cm). The full ATX form factor provides for greater component count and thus expandability, while the micro-ATX form factor provides for a more compact assembled system. One advantage of this particular pair of form factors is that they share port placements so that a micro-ATX motherboard can be used in a case designed for a full ATX motherboard.
While it is possible to use an extender that adds PCIe expansion card slots to a micro-ATX motherboard, it can be difficult to achieve the number of slots that a full ATX motherboard can provide. One embodiment addresses this by including a tab on an extender that accommodates an extra expansion card connector. The tab conforms to a complementary cut-away on the motherboard, to provide an extended motherboard with an increased expansion board connector count. This cut-away is entirely within the outline of the micro-ATX board, so that the board can be used in standard micro-ATX chassis. Herein, a “cut-away” is a deviation by a perimeter to the interior of a rectangle that best fits the perimeter, in this case of the motherboard.
From the manufacturer's point of view, one motherboard form factor, e.g., micro-ATX needs to be supplied, rather than two motherboard form factors, e.g., micro-ATX and full ATX, thus consolidating manufacturing and reducing manufacturing costs. In addition design and qualifying times are reduced, further reducing costs and time-to-market. The micro-ATX motherboard can be extended to meet the full ATX expansion card connector count. Other embodiments permit extensions for other form factors.
A motherboard assembly AP1 is shown in
Motherboard extender 13 includes a printed-circuit board 22 and a motherboard connector 23, designed to engage extender connector 21 so that motherboard 11 and extender 13 can be physically and electrically connected. Extender 13 also bears a series 25 of three PCIe slots C4-C6 and other components 27 designed to extend the capabilities of motherboard 11 when extender 13 is attached. The dimensions of motherboard extender 13 correspond to the difference between an ATX form factor and a micro-ATX form factor.
Motherboard 11 and extender 13 are shown separated in
Motherboard extender 13 defines a “best-fit” rectangular extender outline 41, which is represented by a dot-dash line where it deviates from the perimeter of extender 13. The deviation occurs along a first side 43 of extender 13. In this case, the deviation is to the exterior 45 of extender outline 41. The deviation to the exterior defines a tab 47. The shape of tab 47 is complementary to the shape of cut-away 35 so that they conform to each other when extender 13 engages motherboard 11.
PCIe connector C4 is mounted on extender 13 so that it overlaps tab 47. Herein, “overlap” means that the orthogonal projection of an object (in this case PCIe connector C4) intersects a target (in this case, tab 47). Having PCIe connector C4 on tab 47 permits it to be disposed over the boundary of motherboard outline 31 and extender outline 41 when extender 13 is connected to motherboard 11. Without this complementary arrangement between cut-away 35 and tab 47, the boundary between outlines 31 and 41 could be a dead zone for expansion-card connectors. In other words, the illustrated arrangement allows seven rather than six PCIe connectors. The extra PCIe connector can be a competitive factor in the market place and a substantial asset to a well-provisioned computer.
A method ME1 in accordance with an embodiment of the invention is flow charted in
Method segment M2 involves mechanically and electrically engaging motherboard connector 21 and extender connector 23. This connection extends the PCIe bus (not shown) on motherboard 11 to service PCIe connectors C4-C6 on extender 13. Also, components 27 on extender 13 are communicatively coupled to motherboard 11. These components can include a USB hub, mini-card slot, an eSata port, etc. These and other variations upon and modifications to the illustrated embodiment are provided for by the following claims.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/US2009/032763 | 1/31/2009 | WO | 00 | 7/27/2011 |