Het afgelopen jaar zijn veel nieuwe moederbord-ontwerpen voorzien van vage nieuwe slots, maar niemand heeft kaarten die erin passen. Voor de tweaker zijn deze dingen dan ook pure ruimteverspilling, maar mocht je je toch afvragen waarom deze 'riser slots' ontworpen zijn, wat ze er mee van plan zijn en wanneer je er profijt van hebt is dit artikel van Inquest Market Research interessant. In de tekst wordt verder uitgebreid uitgelegd wat de verschillen zijn tussen Intels CNR en de standaard ACR (de opvolger van AMR):
The proponents of ACR and CNR both purport to have created a flexible, cost-reduced solution for integrated LAN / WAN, multi-channel audio, Home PNA, POTS modem, broadband (ADSL) and other communications functions. Such a high level of integration on a single riser card can substantially reduce costs while increasing the flexibility for OEMs to accommodate different connectivity options. Other benefits include the ability to differentiate, improve reliability, supportability and to free up PCI expansion slots during a time when fewer seem to be available on new PCs.
[...] When contrasted, CNR carries the appearance of a proprietary niche solution that gratifies Intel’s desire to bundle, while ACR looks more like a flexible and open industry standard, crafted by a group of world class competitors to address the needs of a broad market. Configuration flexibility is a key point of leverage for IT managers and for OEMs. The superior flexibility of ACR ensures that all market segments can be targeted with a suitable riser card solution.