The newer generation also brings better efficiency in encoding algorithms, thus reducing overall power usage. For instance, a device requiring two lanes on 2nd generation PCIe interface would only require a single road on 3rd generation. The much higher throughput of the successive generation has a lot of ramifications. The point to note here is that each successive PCIe generation doubles the per-lane throughput (speed) compared to the previous generation.
On the other hand, a single 3rd generation PCIe lane doubles the speed to about 1.0 GB/s. VersionĪs the table above shows, a single 2nd generation PCIe lane has a speed of 0.5 GB/s or 500 MB/s. A Review of the PCIe Generation and the Speedsīefore we delve into backward compatibility, it is worth briefly looking into PCIe generation and its corresponding transfer speeds. In the following text, I talk about PCIe card backward and forward compatibility. However, as mentioned earlier, there are a few caveats that you need to take into consideration, particularly in terms of performance.
Yes, you can use a PCIe 3.0 card in a 2.0 slot, but with some caveats, which I will cover below.Ī third-generation (PCIe 3.0) card will work in a second-generation (PCIe 2.0) slot because the PCIe standard is designed to be backward and forward-compatible, thus allowing the use of new cards on older hardware and vice versa. With most new expansion cards coordinating with v3.0, it is common to ask: can I use a PCIe 3.0 card in a 2.0 slot? Currently, PCIe 3.0 is the most common version on motherboards, but if you have an older PC, it may conform to the older PCIe v2.0.
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