Vec645 Hot

If your input voltage is high (say, 48V), add a simple switching pre-regulator to drop it to 12V before feeding the VEC645. The VEC645 then only dissipates heat from 12V to 5V, a 7V drop instead of 43V—a sixfold reduction in heat generation.

We ran the Vec645 Hot through a series of stress tests using a standardized open-air test bench (ambient temp 24°C). Here is what we observed. vec645 hot

Below is a minimal, self‑contained example that demonstrates how to manually write a vec645‑friendly inner loop for a dot‑product of two 64‑bit integer arrays, using GCC’s vector extensions. If your input voltage is high (say, 48V),

#include <stddef.h>
#include <immintrin.h>   // AVX‑512 for illustration (vec645‑compatible)
// Compute dot product of two int64_t arrays
int64_t vec645_dot(const int64_t *a, const int64_t *b, size_t n)
// Ensure n is a multiple of 8 (512‑bit / 64‑bit lanes)
    size_t i;
    __m512i acc = _mm512_setzero_si512();   // accumulator vector
for (i = 0; i + 7 < n; i += 8) 
        // Load 8 elements from each array
        __m512i va = _mm512_loadu_si512((void const*)(a + i));
        __m512i vb = _mm512_loadu_si512((void const*)(b + i));
// Multiply & horizontally add
        __m512i prod = _mm512_mullo_epi64(va, vb);
        acc = _mm512_add_epi64(acc, prod);
// Horizontal reduction of the accumulator
    int64_t result = _mm512_reduce_add_epi64(acc);
// Tail handling for remaining elements (if any)
    for (; i < n; ++i)
        result += a[i] * b[i];
return result;

Why this is “vec645 hot”: