XC6VLX550T vs XC6VLX760: Which Virtex-6 FPGA Fits Your Design?

ElecSuppliers Part Number ComparisonAug 18, 2026

The XC6VLX550T and XC6VLX760 are both high-capacity Xilinx Virtex-6 FPGAs, but they are not simply two versions of the same device.

The XC6VLX550T belongs to the Virtex-6 LXT family and includes GTX low-power serial transceivers. The XC6VLX760 belongs to the Virtex-6 LX family and focuses more heavily on programmable logic and I/O capacity. Xilinx's Virtex-6 product documentation lists 549,888 logic cells for XC6VLX550T and 758,784 for XC6VLX760.

That difference makes this comparison particularly useful for engineers working with legacy Virtex-6 hardware.

XC6VLX550T vs XC6VLX760 Specifications

The most interesting point is that XC6VLX760 has considerably more logic capacity, but XC6VLX550T provides GTX transceivers.

That means the larger device is not automatically the better choice.

XC6VLX550T Is About More Than FPGA Capacity

The T in XC6VLX550T is important because this device belongs to the Virtex-6 LXT family.

Its architecture is intended for applications that combine substantial programmable logic with high-speed serial connectivity.

The device provides up to 36 GTX low-power transceivers, making it suitable for designs that need multiple high-speed serial links.

This can be valuable in communications, networking, data acquisition, instrumentation, and other systems where moving data between devices is as important as processing it.

XC6VLX760 Takes a Different Approach

The XC6VLX760 provides more programmable logic than XC6VLX550T.

Xilinx lists 118,560 slices and 758,784 logic cells for XC6VLX760, compared with 85,920 slices and 549,888 logic cells for XC6VLX550T.

For a design dominated by large amounts of custom logic, parallel processing, state machines, or internal data paths, that additional fabric can be more valuable than having integrated GTX resources.

This is why the two devices should be selected according to architecture rather than simply device size.

The Real Question: Logic or High-Speed Serial?

For a new FPGA design, one of the first questions should be:

Does the design need dedicated GTX transceivers?

If the answer is yes, XC6VLX550T has an important architectural advantage.

If the design does not need those serial transceivers and instead requires as much programmable logic as possible, XC6VLX760 becomes more interesting.

This distinction makes the comparison very different from a typical “small FPGA vs large FPGA” discussion.

XC6VLX550T for High-Speed Connectivity

XC6VLX550T can be attractive in systems that need multiple high-speed connections.

Its GTX resources can be used as part of architectures involving high-speed serial communication between FPGA devices, processors, converters, networking components, and other hardware.

The availability of dedicated transceivers can also reduce the need to implement high-speed interfaces entirely from general-purpose I/O.

For legacy systems built around Virtex-6 serial connectivity, this can make XC6VLX550T particularly difficult to replace with a simple larger LX device.

XC6VLX760 for Large FPGA Processing

XC6VLX760 is more interesting when the primary requirement is programmable-logic capacity.

With more than 758,000 logic cells, it provides a significantly larger fabric than XC6VLX550T.

Applications that contain large amounts of parallel logic can benefit from this additional space.

Examples include complex control systems, large digital-processing pipelines, instrumentation, image-processing architectures, and custom hardware accelerators.

The choice becomes straightforward when the application is heavily logic-bound and does not depend on GTX serial connectivity.

DSP Resources Tell a Different Story

Interestingly, the difference in logic capacity does not mean that every resource increases proportionally.

Both devices are listed with 864 DSP48E1 slices in the Virtex-6 LXT/LX product table.

This is important for DSP-heavy designs.

If an application is limited primarily by DSP slices rather than LUTs, moving from XC6VLX550T to XC6VLX760 may not provide the expected improvement.

Engineers should therefore check the actual resource that is limiting the design before selecting the larger FPGA.

Memory Capacity Also Needs Attention

XC6VLX550T provides approximately 22,752 Kb of block RAM, while XC6VLX760 provides approximately 25,920 Kb.

The increase is smaller than the increase in logic capacity.

This means a design that is constrained by BRAM may not gain as much from moving to XC6VLX760 as a LUT-heavy design would.

For applications involving large FIFOs, buffering, lookup tables, or internal data storage, BRAM utilization should be checked independently.

Package Selection Matters

Package selection is another major difference between these devices.

Xilinx's package information lists XC6VLX550T in FF1759 and FF1760 packages, while XC6VLX760 is available in the FF1760 package.

This creates an important distinction for replacement projects.

If an existing PCB uses the FF1760 package, XC6VLX550T and XC6VLX760 may both be relevant candidates for further investigation.

If the board uses a different package, the options become more limited.

However, sharing an FF1760 package designation should not be interpreted as automatic pin compatibility. The exact device pinout and power configuration must still be verified.

Can XC6VLX760 Replace XC6VLX550T?

Not automatically.

XC6VLX760 provides more logic capacity, but the XC6VLX550T includes GTX transceiver resources that are fundamental to some designs.

If the existing XC6VLX550T board uses GTX interfaces, moving to XC6VLX760 would require a detailed hardware and architecture review.

A larger logic fabric cannot compensate for the absence of a required dedicated serial interface.

This is one of the most important differences between the two devices.

Can XC6VLX550T Replace XC6VLX760?

This migration has the opposite problem.

XC6VLX550T has fewer logic cells than XC6VLX760.

If the existing XC6VLX760 design uses a large percentage of its programmable fabric, the smaller device may not have enough capacity.

However, if the design uses relatively little logic but requires high-speed serial connectivity, XC6VLX550T could still be attractive for a redesigned architecture.

The actual Vivado implementation results should be used rather than relying only on the nominal logic-cell numbers.

XC6VLX550T Replacement Considerations

When searching for an XC6VLX550T replacement, the first step should be identifying whether the GTX transceivers are actually being used.

If they are, the replacement must provide a suitable high-speed serial architecture.

If they are not being used, there may be more flexibility to consider devices with a different resource balance.

For an existing production board, package, pinout, power, I/O banks, clocking, and serial connections all need to be checked.

For a new design, a newer FPGA generation may offer better long-term capabilities, but that usually means redesigning the hardware around a different device.

XC6VLX760 Replacement Considerations

For an XC6VLX760 replacement, logic capacity is likely to be one of the first parameters to examine.

The replacement should have enough programmable logic, memory, DSP resources, I/O, and clocking capability for the existing design.

If the application does not require the exact Virtex-6 architecture, newer FPGA families can also be evaluated.

For a legacy system, however, maintaining the existing package and board architecture may be more important than moving to a newer generation.

Which Virtex-6 FPGA Should You Choose?

Choose XC6VLX550T when high-speed serial connectivity and GTX resources are important to the design.

Choose XC6VLX760 when the main requirement is a larger programmable-logic fabric and the application does not depend on the GTX resources provided by the LXT device.

The most important lesson from this comparison is that FPGA capacity is not one-dimensional.

XC6VLX760 has more logic, but XC6VLX550T brings a different hardware capability through its GTX transceivers. For replacement and migration projects, the correct choice therefore depends on the actual architecture, not simply on which part has the larger device number.