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Deep test expertise
DDR4 / DDR5, LPDDR4(X) / LPDDR5 across densities and system-board IC test scenarios.
Test with conviction
Precision memory test. Reliable partnership.
With more than a decade of system-level test experience, we build trusted production lines for world-class memory module and wafer customers.
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About RamSun
A steadfast partner focused on memory test
RamSun is more than a test subcontractor—we are the engineering team that works alongside you to optimize process, improve yield, and accelerate delivery. From DRAM system-level IC test to module mass production and automation equipment, we scale capacity with disciplined quality so you can grow confidently in a competitive memory market.
Read moreGlobal footprint
Hsinchu and Shenzhen, close to the supply chain
Headquartered in Hukou, Hsinchu, with a Shenzhen site for Greater China customers and logistics. RD, test engineering, FAE, and logistics work as one organization so every program—from bring-up and validation through MP—gets a timely response.
Locations & contactWhy RamSun
Sound test judgment from the factory floor
Like leading IC houses investing in technology depth, we treat repeatable results, traceable data, and scalable capacity as the core of test services.
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Flexible capacity
Module lines, testers, and DUT counts scale with your annual plan and seasonal demand.
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Aftermarket & enablement
RD / TE / FAE joint support: equipment training, troubleshooting, and tailored warranty plans.
Capabilities
One of the most capable memory test & module partners
Hundreds of millions of DRAM ICs tested, spanning the industry’s transition from DDR4 to DDR5. We feed test data and engineering know-how back into your programs, hardware fixtures, and takt—so “test” is not just a station but part of overall competitiveness.
Services & specifications12+
Years in DRAM IC test
10B+
ICs tested (order of magnitude)
50+
IC test systems
35+
Module test lines
60+
Customers
Product & Service
From IC test and module build to our own equipment
One partner for coverage, capacity, and capital equipment decisions in memory.
Memory IC Test
Memory IC test services
DDR4 / DDR5, LPDDR4(X) / LPDDR5; 4G–64G densities and diverse DIMM / device applications. Annual test volume continues to grow.
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RSTi-MT
Memory module manufacturing
DDR5 x8 / x16, 16GB–64GB, 4800–7600 Mbps. Line capacity and test takt align with your roadmap.
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RSTi-M3 / LM5
Automated test equipment
DDR4 / DDR5 / LPDDR families; 168–256 DUT configurations to build or expand your test floor.
Learn moreAfter sales
With you from ramp to long-term operations
Technical teams, structured training, rapid issue resolution, and service plans that keep your test assets productive.
- Technical team — RD / TE / FAE / logistics with a single coordinated interface.
- Training — RSTi-M3 / LM5 operation and maintenance programs to shorten the learning curve.
- Fast resolution — FAE-led analysis and reproduction to converge on root cause.
- After sales — Quality warranty and maintenance plans, customizable by program.
News & events
News & events
Event
Ramsun × Strategic Partner Technical Exchange
We will analyze the test data and collaborate with clients to discuss the results of memory testing.
Technology
DDR5 high-speed validation program
Joint bring-up of new data-rate grades and fixtures with key customers. (Sample entry)
CSR
Module testing technology
Continuously optimize memory module OC testing efficiency
Partner with us
Ready to take your test operations to the next generation?
Share your requirements and timeline—our RD and FAE teams will reach out promptly.
Contact RamSun