Sapphire R9 390X 8GB Damaged Capacitors Location

Damaged capacitors on a Sapphire R9 390X 8GB are most commonly the small cylindrical SMD electrolytic capacitors located around the GPU core and the VRM (voltage regulator module) area near the top edge of the card. You can find them by removing the cooler and examining the board for bulged tops, leaked electrolyte, or brown residue; they are typically 820µF, 2.5V or 330µF, 2.5V polymer capacitors.

Background: Why the R9 390X Has Capacitor Issues

The Radeon R9 390X, launched in 2015, is a rebadged and refined version of the R9 290X with 8GB of GDDR5 memory. It draws up to 275W under load, placing significant stress on the VRM circuitry. Sapphire’s custom boards, including the Nitro and Tri-X models, use a mix of solid polymer and electrolytic capacitors. Polymer capacitors are generally more durable, but the card’s high operating temperatures and aging can cause failures, especially in the VRM output filter section.

Capacitors are used to smooth voltage ripple. When they degrade, the GPU can receive unstable power, leading to crashes, artifacts, or failure to boot. The R9 390X is now a decade old, so many units are showing capacitor wear.

Where Exactly to Look for Damaged Capacitors

To inspect the capacitors, you must remove the cooler (usually 8-10 screws on the backplate and four around the GPU). Once the board is exposed, focus on these areas:

• VRM area (top-left and top-right of the GPU): This is the most common failure zone. Look for a row of small cylindrical capacitors (often black or blue) with a cross-shaped score on top. If the top is bulged or the cross is split, they are damaged.
• Around the GPU core: A cluster of tiny capacitors (often 0805 or 0603 size) sits very close to the die. These are ceramic and rarely fail, but check for cracks or missing pieces.
• Memory power section: Near the VRAM chips, you’ll find a few capacitors for the memory voltage regulator. They are similar to the VRM ones but often smaller.
• PCIe power connectors area: The 8-pin and 6-pin power input area has bulk capacitors to handle input filtering. These are larger and can bulge if the PSU has voltage spikes.

Use a bright light and magnifying glass. Bulging is the most obvious sign; electrolyte leakage appears as a white or brown crusty deposit around the base.

How to Identify the Exact Capacitor Value

If you find a damaged capacitor, you must replace it with the correct value. On the R9 390X, the VRM output capacitors are typically:

• 820µF, 2.5V – polymer aluminum (often black, low profile)
• 330µF, 2.5V – polymer (used in some positions)
• 100µF, 16V – electrolytic (for input filtering)

These values are printed on the side of the capacitor. If not, check the board silkscreen; it may have a reference designator like “EC1” but not the value. You can also look up a schematic for the reference board (e.g., the AMD reference R9 390X design) to confirm. Do not guess – using a wrong capacitance can cause instability or damage.

Common Symptoms of Capacitor Failure

If your card is showing any of these, capacitor failure is a likely cause:

• Random black screens or driver crashes under load
• Artifacts (glitches, lines, or flickering) during gaming
• Failure to POST (no display) with fans spinning
• High-pitched whining from the VRM area
• Visible bulging or corrosion on the capacitor tops

Note that not all crashes are capacitor-related. Thermal paste drying out or VRM MOSFET failure can mimic similar symptoms. Always inspect capacitors first because they are easier to see.

How to Replace Damaged Capacitors Safely

Replacing capacitors requires basic soldering skills. Here’s a step-by-step guide:

1. Remove the cooler and clean the board with isopropyl alcohol to see the capacitors clearly.
2. Take a photo of the area to remember orientation (polarity). The negative side is usually marked with a stripe on the capacitor and a white half-circle on the board.
3. Desolder the old capacitor using a soldering iron (around 350°C) and a solder sucker or wick. Be careful not to lift the pads.
4. Clean the pads and apply fresh solder.
5. Insert the new capacitor matching polarity. For polymer caps, the negative side has a colored stripe.
6. Solder and trim the leads if any.
7. Test the card with a multimeter for shorts before reassembling.

If you are not confident, take the card to a repair shop. A botched solder job can permanently damage the PCB.

Comparison: Electrolytic vs. Polymer Capacitors

The R9 390X uses both types. Electrolytic capacitors are cheaper but have a shorter lifespan (typically 2,000-5,000 hours at high temperature). Polymer capacitors have lower ESR (equivalent series resistance) and last longer (up to 20,000 hours). When replacing, use polymer if possible, as they handle ripple better. However, ensure the voltage rating is equal or higher than the original.

Cost and Where to Buy Replacement Capacitors

Individual capacitors cost between $0.50 and $2 each. You can find them at electronics distributors like Digi-Key, Mouser, or Amazon. Search for “820µF 2.5V polymer capacitor” or “330µF 2.5V” and match the size (diameter and height) to fit under the cooler. For example, a common size is 8mm diameter x 7mm height. If you can’t find the exact value, a slightly higher voltage rating (e.g., 4V instead of 2.5V) is safe, but do not change capacitance significantly.

Frequently Asked Questions

Can I run the card with a bulged capacitor?

No. A bulged capacitor has lost its electrolyte and may short-circuit. Continuing to use the card can damage the VRM or GPU permanently. It’s best to stop using it until repaired.

Do all R9 390X cards have this problem?

Not all, but it’s common due to age and high heat. Sapphire’s Nitro models have better cooling, but the VRM capacitors still age. Cards that were mined on or overclocked are more likely to have failures.

How do I know if a capacitor is damaged without removing the cooler?

You can’t visually inspect without disassembly, but you can test for shorts using a multimeter on the PCIe power pins. If the card doesn’t boot and you hear a clicking sound from the PSU, it may be a shorted capacitor.

Can I replace a capacitor with a higher capacitance?

No. Increasing capacitance can cause the VRM to become unstable or oscillate. Stick to the original value or within ±10%.

Is it worth repairing a R9 390X in 2025?

If you can do the repair yourself for under $10, it’s worth it for a backup card. However, the card’s performance is now entry-level, so if you need a repair shop, the cost may exceed the card’s value.

Related

• Frequency and Wavelength Equation Explained
• 32 Ounces to Cups and Tablespoons Conversion
• Energy Efficiency in Physics: What It Really Means